Kirill
journeyman
Reged: 10/09/09
Posts: 6
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Hello,
I'm a beginner with this hobby and I found a lot of positive testimonials about the Miyauchi binoculars.
But I can't find any information about this manufacture. No website, no items in stock, no any information at all.
Are there any of you people who have long experience in astronomy and who can tell me about this manufacture? Is it still in business? Any places where I can buy Miyauchi binocular?
Yesterday I signed up for astromart account. Hope to find more places for hunting.
I'll also appreciate any information about similar class manufactures if any. I know about Takahashi, but looks like their 22x60 model has been discontinued.
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Rick
Post Laureate
Reged: 04/12/05
Posts: 3045
Loc: Tokyo, Japan
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Hi and welcome to CN. Miyauchi went out of business about a year ago.
cheers,
Rick
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www.japanastro.com
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medinabrit
professor emeritus
Reged: 10/27/04
Posts: 648
Loc: medina ohio USA.
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Although they are not producing Miyas anymore you can still sometimes find them on Astromart or Cloudy nights .
I have purchased 3 in the last 2 years.
They really are an exellent binocular.
You also find the Tak astronomer occasionally .Another exellent bino.
In spite of a few negatives ive read on these fine binos i love mine.
Brian.
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WallyT
newbie
Reged: 09/16/09
Posts: 2
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Kirill,
I just saw a complete Myauchi setup for sale on Astromart Classifieds in the Binoculars section. If only the boss would let me, I'd get 'em asap.
Wally 
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Kirill
journeyman
Reged: 10/09/09
Posts: 6
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Thank you Rick,
Can you suggest any alternatives? I noticed you have Vixen on your website. They have BT80M Binocular in production.
I'm looking for $1000-$2000 binocular like Miyauchi 77. That can produce a good picture on a high magnification. I'm not fluent in astronomical terminology. I mean the limit that most of binoculars have and only the best models can handle 75x or even 100x magnification.
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Kirill
journeyman
Reged: 10/09/09
Posts: 6
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WallyT,
I noticed this is "pre interchangeable eyepiece version". I want to have a chance to play with the different magnification.
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OpalescentNebula
super member
Reged: 01/11/07
Posts: 115
Loc: Calgary, Alberta, Observing so...
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Miyauchi is a great binocular as are a few others, but I personally feel if you are going to go over 55x then look at a telescope or adding a Binoviewer to a telescope. You will enjoy the views far better. 
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Yours truly,
Bill
"Good friends are like stars...you don't always see them, but you know that they are always there" - unknown
Binos : various binos, Zeiss 10x42 FL, Garrett Optical 20x110
telescope: WO Megrez 110 ED
Eyepieces: 13mm Ethos, 5mm Pentax XO, 28mm WO & 2x Powermate
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14731
Loc: Cumberland, R I , USA42N71.4W
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Quote:
Miyauchi is a great binocular as are a few others, but I personally feel if you are going to go over 55x then look at a telescope or adding a Binoviewer to a telescope. You will enjoy the views far better.
Except that generally, you either view with one eye OR you do not get as large a field of view, unless of course you invest in a zero mag OCS for a binoviewer and use it on an f/5 telescope.
Each has it's own advantages. I use scopes, binoculars and scopes with binoviewers.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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Kirill
journeyman
Reged: 10/09/09
Posts: 6
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Quote:
Miyauchi is a great binocular as are a few others, but I personally feel if you are going to go over 55x then look at a telescope or adding a Binoviewer to a telescope. You will enjoy the views far better.
I agree about the big magnification without having a look at the binocular. But choosing a brand and then the model is still an issue for me.
When I read Ed Zarenski review "Oberwerk 15 x 70 Vs Orion Giant 16 x 80" I said "OK, let's try this Oberwerk". When it came to me I realized that this was a waste of money. It was born with Cat Eyes. Any prism adjustments always produce the same results, the Cat Eyes effect still stays. Construction... it’s sad but I can't use this word to this binocular after my University courses in mechanic and materials.
To learn a bit about binocular internals and become a little more self educated I purchased “Choosing, Using and Repairing Binoculars”, by J.W.Seyfried. Waiting for delivery...
I understand that "Good" is rather relative. I also live in a place where I have near to zero chances to try a really good binocular or telescope. It looks like I need a list of manufactures that make products with stable quality, with a collimation possibility or factory adjusted with a solid construction. Then purchase such item online and enjoy the views.
The telescope is OK. Now I need something that fits my balcony. It is 80 cm in width. I don't plan extensive observation out of city in the nearest feature. But I can compensate this with my ability to enjoy the views each time I have a clear sky. I'm self employed and I don't need to be at my job at early morning.
More expensive item will delay the purchase. I'm open to any suggestions about any really good quality products. Maybe some of them are available for purchase from the dealers in Moscow.
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Kirill
journeyman
Reged: 10/09/09
Posts: 6
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Quote:
Each has it's own advantages. I use scopes, binoculars and scopes with binoviewers.
Nice to see you in this thread, Ed!
Have you anything to say about Vixen BT80M? It's present in Moscow and has wider eyepieces choice.
On a Russian forum I heard that "Vixen is like a Japanese Meade". But Russians are less experienced in expensive things.
It is the most inexpensive choice I found. Any $1000 binocular from U.S. will cost me: DHL delivery (about $450) plus custom will charge me about 30% of item price + delivery price = about twice higher than U.S. price.
Maybe I'll be able to find other brands if any suggestions. But I'm sure that Fujinon is absent in Russia.
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Erik D
Post Laureate
Reged: 04/28/03
Posts: 3196
Loc: Central New Jersey, USA
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Available in Europe:
http://www.apm-telescopes.de/apm-100-mm-ed-semiapo-binocular_proinfo_30715.html
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Kirill
journeyman
Reged: 10/09/09
Posts: 6
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Quote:
Available in Europe:
http://www.apm-telescopes.de/apm-100-mm-ed-semiapo-binocular_proinfo_30715.html
Thank you. This brand is totally new for me. I'll read as much as I can about this item.
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Erik D
Post Laureate
Reged: 04/28/03
Posts: 3196
Loc: Central New Jersey, USA
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APM APO telescopes have been around for about a decade. The optics are made in Russia, OTA in Germany. The APM 100 mm ED binocular is a Chinese import. It's the same design as the one offered by Garrett Optical in the USA:
http://www.garrettoptical.com/Garrett-100mm-Binocular-Telescope-p/gt100-45.htm
You can find several reviews of the GO version in the binocular mini-review section of this forum.
I am not sure if there is a difference in the objective glass. APM says his is "semi-apt". Garrett makes no such claim. Mechanical construction should be the same. From the APM America web page:
http://apmamerica.com/index.php?main_page=product_info&cPath=10&products_id=64
My friend has an older pair of APM 45 deg 100mm with non standard 25X and 40X EPs. He purchased a pair for $995 USD. Less than 1/2 of what a pair of 100 mm Miyauchii cost. Mechanical construction is a step below the Miyauchi too. I hope the newer version is better.
I suggest you make sure there is some way APM can handle the after sales warranty/exchange issues for you in Russia before making the purchase.
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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From what I can see, about the only difference between the GBT 100/45 and the APM 100/45 is the color, one is black and one is white.
Also, it has been many months now since anyone has reported their findings on the GBT 100/45.
Beachchairbill
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GlenM
Vendor
Reged: 05/20/07
Posts: 1738
Loc: Lancashire UK
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I've still got mine Bill
Been a bit busy and the weather's not been at best either. I see you now have a mirror thingy 
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Glen
www.lyraoptic.co.uk
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Anyone tried Glenn's method of measuring the effective aperture of the Garretts/APMs yet? How about the Miyauchi Galaxy/ Exceed owners? It's one more bit we need to know about these models! Bad astro weather is a great excuse to fiddle with your giant binoculars in the comfort of the house!
True aperture? A Quick Way to Measure!
I measured the f7.5 Miyauchi Saturn IIIs at 100mm but don't know about the faster f5 Miya Galaxy or the Garrett f5.3 models. Come on guys, it's easy!
If we don't document this information here on the Binocular forum where else is anyone going to find it? We're not going to see new Miyauchis any more so let's quantify the clones!
Rich V
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Binoculars:
33/50/75/150x100 Saturn III, 16x70 FMT-SX, 10x50 PCF-V, 10x43 DCF-SP, 10x35 E2, 7x35 E, 8x30 E2, 7x26 Custom, 8x23AS Diplomat, 8x23 Travelite
Scopes:
C9.25, 6" f8 reflector, SV80S
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Philip Levine
super member
Reged: 03/22/07
Posts: 156
Loc: near Boston, MA
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Hi Erik,
APM, Garrett, who can keep the details straight?
With all the "American" sounding manufacturer names, who wouldn't be confused as to where items are made, Russia, China, etc.
I am wondering if someone more knowledgeable than me might create a current listing in table form for this forum, an objective table, listing country of orgin, type of glass used, coating, focal length, eye relief, as well as magnification, aperature.
Phil
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_________________________________________________
Zhumell 10" Dob (modified with degree circle and Wixey inclinometer)
26mm 2" GSO eyepiece
9mm 1.25" GSO eyepiece
13mm Nagler T6
Crayford focuser
DewBuster w/homemade heater strips
Nikon 10x50 EX binoculars
University Optics 11x80 binoculars
Fujinon 16x70 FMT SX
Surveyor Tripod w Universal Astronomics Parallelogram
member International Dark-Sky Association
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KennyJ
Reged: 04/27/03
Posts: 12895
Loc: Lancashire UK
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< I am wondering if someone more knowledgeable than me might create a current listing in table form for this forum, an objective table, listing country of orgin, type of glass used, coating, focal length, eye relief, as well as magnification, aperature. >
Philip ,
I'm sure that 95% of what you request already exists in even greater detail in the exhaustive articles , reports and reviews , just by the forum moderator EdZ alone !
Gathering and digesting information such as this can be a bit like choosing and eating food .
Fast food may be the quickest , easiest option , but is seldom the most nourishing or most healthy .
The information is right here in the archives , it just needs time and patience to locate , read and digest it all !
Kenny
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If everyone is thinking the same thing , no-one is thinking - General George S.Patton
Zeiss 7 x 42 BGAT
Captain's Helmsman 7 x 50
Nikon 10 x 42 Superior E
Swift Audubon Kestrel 10 x 50
Helios 15 x 70 Observation
Strathspey 20 x 90
Televue 76 APO
Zeiss 85 Diascope
Helios 102 f5 refractor
Various eyepieces barlows tripods mounts etc.
Panasonic Lumix DMC - TZ5 digital camera
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Glen,
I still have mine and they are set up looking out my kitchen window. Wonder how they have been selling as of late, if at all?
Rich V - I will take a look at your True Ap and see if I can figure it out.
Erik D - welcome back
BB
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V
Does this sound right for the GBT 100/45 - 3" or can you add more details for this test. Also, I had a 20mm EP in the focuser at the time.
BB
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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BB, 3" seems pretty small for a 4" binocular; did you hold the flashlight a foot or so behind the eyepiece? If the light is too close, the measurement may not come out right. I know it's kind of awkward to do by yourself.
I would expect a measurement closer to if not 4". The eyepiece you use shouldn't make a difference. One more try just in case?
Thanks,
Rich V
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Binoculars:
33/50/75/150x100 Saturn III, 16x70 FMT-SX, 10x50 PCF-V, 10x43 DCF-SP, 10x35 E2, 7x35 E, 8x30 E2, 7x26 Custom, 8x23AS Diplomat, 8x23 Travelite
Scopes:
C9.25, 6" f8 reflector, SV80S
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14731
Loc: Cumberland, R I , USA42N71.4W
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Quote:
Does this sound right for the GBT 100/45 - 3" .....
3" seems pretty small....
I would expect a measurement closer to if not 4".
I'd expect a measurement closer to 90mm.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V/
I will give this another tre and hold the flash light back further. The boss will get involved with this one ( my wife Gerry).
Ed
90mm can you caculate this for me.
Thanks
BB
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BarrySimon615
Pooh-Bah
Reged: 03/01/04
Posts: 1279
Loc: New Orleans, LA
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Quote:
Anyone tried Glenn's method of measuring the effective aperture of the Garretts/APMs yet? How about the Miyauchi Galaxy/ Exceed owners? It's one more bit we need to know about these models! Bad astro weather is a great excuse to fiddle with your giant binoculars in the comfort of the house!
True aperture? A Quick Way to Measure!
I measured the f7.5 Miyauchi Saturn IIIs at 100mm but don't know about the faster f5 Miya Galaxy or the Garrett f5.3 models. Come on guys, it's easy!
If we don't document this information here on the Binocular forum where else is anyone going to find it? We're not going to see new Miyauchis any more so let's quantify the clones!
Rich V
I just did as requested for the Miyauchi Galaxy BJ100's. See the True Aperture - Quick Way to Measure thread for comments about it and several other binoculars. Anyway I measured mine at 98 mm via the extended light image. As the clear aperture of the objective measures a true 100 mm, edge to edge, I would suspect that a slightly too close first baffle may be the culprit. Good trade-off however if it cleans up the image at the edge of the field.
Barry Simon
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Thanks, Barry, it's heartening to see your 100mm Miyauchis are operating very close to full aperture. I was pleased with the Saturn results as well.
Rich V
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V, EDZ,
Barry, nice work and her is an update on the GBT 100/45 - At eight inches back from the ep the measuremennt has been corrected to four inches reather than three. Four hands are better than two. I did note that at this distance, I could not achieve a full circle - not sure what you would call the immage on the wall. I think this was shown on a previous thread several months ago. When I moved the light closer to the ep about 3 inches the image changed to a full circle. I measured the cross diameter of the objective lense and it measured app. four and a quarter inches . If I can help with additional measurements, please say the word.
BB
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Bill, did the circles have small flat spots intruding into them pointing towards the centerline of the binocular? If so, it's likely you were seeing the prism edges in the light path.
Like you say, there was a thread earlier this year (right after a batch of Garretts were shipped, IIRC) about the shape of the exit pupil; that might equate to the shape you're seeing projected on the wall. Hopefully the "missing" areas of the circle are small. 
Thanks for the effort,
Rich V
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BarrySimon615
Pooh-Bah
Reged: 03/01/04
Posts: 1279
Loc: New Orleans, LA
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Quote:
Rich V, EDZ,
Barry, nice work and her is an update on the GBT 100/45 - At eight inches back from the ep the measuremennt has been corrected to four inches reather than three. Four hands are better than two. I did note that at this distance, I could not achieve a full circle - not sure what you would call the immage on the wall. I think this was shown on a previous thread several months ago. When I moved the light closer to the ep about 3 inches the image changed to a full circle. I measured the cross diameter of the objective lense and it measured app. four and a quarter inches . If I can help with additional measurements, please say the word.
BB
With all the binoculars I have tested - from the 100 mm Miyauchi on down to the Series 2000 7x35 Fujinon, the projected image on the wall was always bigger than the binocular aperture at close distances up to and including the flashlight "seated" on top of the eyepiece. I would consider a measurement to be valid when I would back the light away enough where it reached the point where the projected image would not change in diameter, typically at about 8 inches and beyond.
I also plan on measuring some of my refractors - both with eyepieces straight in without a diagonal, and then again with a diagonal. While I no longer have one, I would be very curious to see how an Orion ST120 does as I have always held that an unmodified one has some light cone cut off due to the focuser drawtube clipping some of the light cone.
Barry Simon
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V,
Took another look tonight and it looks like this, full half circle from left to right and then a line from top down a quarter of the way down, then a streight line down for about the same length and then another line from the bottom up to the streight line down. They are all connected and represent the right side of the circle. This is not easy to describe, however I think you get the picture.
So getting back to the original question, what is the true apature of the GBT 100/45?
Thanks
BB
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Bill, I found the GT100 thread from last March; is this the shape you see (top of the page)?
GT100 exit pupil cutoff
If the above shape is what you're seeing, then your measured 4" aperture is being reduced by the areas of the flat intrusions into the light path. It seems to vary from one sample to another.
Rich V
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V.
The left one is right on the money. In otherwords the left one is what I see out of the right side.
However, I could not make this happen with the left side and it was fun to try this going from right ep to left ep. In other words, the left side was always a circle.
Here is another issue that I found when performing this test - when shining the light down the left
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Oops,
When shinning the light down the left tube from the objective lense, I was able to see a large crack in the tube about center way down with many crums sittting inside. I did not find this in the right side tube. Interesting, and hope the crack does not expand.
Hope this helps?
Beachchairbill
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Ouch! What's with the crack?? Does it go between the screws that attach the tube to the center casting? This could be a big potential problem.
As far as having the prisms intrude into the light path on one side but not the other; I don't know what to say. If you can't see the difference during normal use, I guess it's no big deal. It's just that the QC on these is obviously lacking. If they can get it right on one side then why not the other?
Perhaps you ought to talk with Garrett about both these issues; the crack in the tube doesn't inspire confidence! I'd be afraid that down the road there will be problems after the warranty is over.
It's obvious that just copying Miyauchi's design doesn't make a Miyauchi. I hope Garrett can make things right for you, Bill.
Best regards,
Rich V
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Binoculars:
33/50/75/150x100 Saturn III, 16x70 FMT-SX, 10x50 PCF-V, 10x43 DCF-SP, 10x35 E2, 7x35 E, 8x30 E2, 7x26 Custom, 8x23AS Diplomat, 8x23 Travelite
Scopes:
C9.25, 6" f8 reflector, SV80S
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V.
I will add to this thread after the Yankees game. Shock is all I can say right now. I would suggest that anyone reading this thread take out a flash light and look into the tubes of your binoculars from front to back, you might get a shock as well. Report if you find some thing interesting.
BB
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V.
I hope you are sitting down for this report and I hope I don't sound like I'm picking on vendors, however, in my openion QC needs to improve at the Maf. or vendor or both.
Let's take the GBT 100/45 first: When I took a look at the crack in the left tube, it is about two inches long and at it's widest point about a quarter of inch and tapers down from there. There are many pieces of debris stuck to the bottom, side and top of the tube. There is no screw protruding from the crack, however, just before the crack starts ( from back to front)there is a side mounting screw set in place which can be seen inside the tube, however, it doesn't look like it created this crack.
The inside mirror has no debris on it and the objective lens is clean and coated. As of right now, I see no abnormal viewing at this time.
Now for the kicker, today, I decided to look at the tubes of my recently purchased Oberwerk 20x80 Standard Binoculars and I'm in shock as to what I found. When I viewed the left tube, I found it to be clean with only several very small specs. I then switched to the right tube and WOW I could not believe my eyes. Here at the back end of the tube is a black painted paper or cardboard washer which had dislodged from the back end of the tube and is brley holding onto the tube screw shaft. When I went back to the left tube, I found that this tube did not have a washer at all. This washer in not blocking the in side mirror by a hair.
I tried to unscrew the right tube but it would not budge. I will write to Oberwerk for their comments.
If their is a check list for checking binoculars when they first received from the vendor, I would add this check point to the list.
Beachchairbill
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Well, Bill, it's a shame that you, the customer, has to be the quality control inspector for a binocular manufacturer and the distributors of their products.
There's no excuse, IMO, for a $230. 20x80 let alone a $1000. 100mm binoscope to have obvious problems like you describe. Just looking into the focuser of the binoscope will show if the prism edges are in the light path; that's easy to check for QC. The same goes for looking into the body of the binocular through the objective for loose or missing parts or otherwise defective assembly.
What's to prevent the buyers of the same manufacturer's $4000. 150mm binoculars from facing the same chances of misaligned optical components or other obvious problems? I wouldn't want to take the chance with my money.
Miyauchi made nicely executed binoculars. I look at their mechanical quality and they make me smile; the fit and finish are beautiful. Yes, they cost twice as much as these new offerings but at least we could choose mechanical quality and good QC if we wanted to pay for it. We don't have that option any more.
End or rant; sorry if I'm overstating the obvious.
Rich V
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Binoculars:
33/50/75/150x100 Saturn III, 16x70 FMT-SX, 10x50 PCF-V, 10x43 DCF-SP, 10x35 E2, 7x35 E, 8x30 E2, 7x26 Custom, 8x23AS Diplomat, 8x23 Travelite
Scopes:
C9.25, 6" f8 reflector, SV80S
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edwincjones
Postmaster
Reged: 04/10/04
Posts: 5667
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"we don't have that option anymore"
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BarrySimon615
Pooh-Bah
Reged: 03/01/04
Posts: 1279
Loc: New Orleans, LA
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Quote:
There's no excuse, IMO, for a $230. 20x80 let alone a $1000. 100mm binoscope to have obvious problems like you describe. Just looking into the focuser of the binoscope will show if the prism edges are in the light path; that's easy to check for QC. The same goes for looking into the body of the binocular through the objective for loose or missing parts or otherwise defective assembly.
What's to prevent the buyers of the same manufacturer's $4000. 150mm binoculars from facing the same chances of misaligned optical components or other obvious problems? I wouldn't want to take the chance with my money.
Miyauchi made nicely executed binoculars. I look at their mechanical quality and they make me smile; the fit and finish are beautiful. Yes, they cost twice as much as these new offerings but at least we could choose mechanical quality and good QC if we wanted to pay for it. We don't have that option any more.
Rich V
I have to agree completely. I believe the distributors, knowing the history of the Miyauchi clones, dating back to at least 2003 (when I compared my Miyauchi 20x77 and 20x100's to the Burgess distributed Miyauchi clones) should do much more careful inspection of the look alikes before they send any pair out of their door. If they found that any problem of one kind or another became the norm rather than the exception, they should just decide not to carry these as it would just not be worth the trouble of checking all of them and the high rate of return. Both of the two pair of clones that we tested had significant problems. Burgess stuck with them for awhile but eventually gave up on them. Oberwerk tested them and may have sold a very few but decided not to add them to their product line. (Oberwerk was a Miyauchi distributor and that is where my 20x100's came from and I have not had any complaints whatsoever about the pair that I got).
Jumping ahead 5 or 6 years we have the new and improved Miyauchi clones which apparently are still not without their problems judging from what I have read. I would suspect that each and every purchase is made with some degree of hesitancy what with some of the problems that have been documented. At least Garrett Optics is a very good company to deal with and I am sure that problems are dealt with and/or returns are handled without a problem. If the problems continue with any frequency, there will come a time when Garrett or any other distributor will decide to drop these binoculars from their product line.
The "Hesitancy" problem has got to be compounded when someone is thinking about buying the much larger pair of 150 mm binoculars as there have probably been far fewer made and sold and the likelihood of there being quite a few teething problems exists. This is something that no one wants with a $4000 investment. It will be interesting to see if the manufacturer of the 100 mm and 150 mm "Miyauchi like" binoculars is able to achieve consistent quality to the point that the end user will purchase these binoculars with confidence.
Barry Simon
Edited by BarrySimon615 (10/23/09 10:42 AM)
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Quote:
"we don't have that option anymore"
The Miyauchi option, Ed.
Rich V
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BarrySimon615
Pooh-Bah
Reged: 03/01/04
Posts: 1279
Loc: New Orleans, LA
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Quote:
Quote:
"we don't have that option anymore"
The Miyauchi option, Ed.
Rich V
Not new, but the deligent, persistent, prospective buyer will eventually be able to find a decent pair of Miyauchi binoculars if he looks for them hard enough.
Barry Simon
Edited by BarrySimon615 (10/24/09 11:07 AM)
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Rich V., Barry Simon,
Whenever I see your post or comments, I immediatly read yours first and what yu have said above is right on the money.
I for one tried and tried and tried to purchase a Miyauchi before I purchased the GBT 100/45. I even went as far as speaking to the Japanese Consulate, however, when your closed your closed.
So far, I have no problems with my GBT or Oberwerk and I will send a message to each vendor about what I have found with the hope that changes will be made in the future with the consumer receiving top rate QC upon purchase.
Now getting back to the original question Rich V what is the true aperture on my GBT for the record.
Thanks
BB
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Quote:
Now getting back to the original question Rich V what is the true aperture on my GBT for the record.
Well, Bill, you said above:
Quote:
At eight inches back from the ep the measuremennt has been corrected to four inches reather than three.
It sounds like your GBT is operating at the full 100mm aperture on the one side and 100mm minus whatever percent you're losing due to the "missing" areas outside of the flat intrusions you see on the other side. Hopefully not more than 10% of area on the "bad" side, which would work out to the equivalent of 95mm. Even if you have 15% obstruction it still equals the area of a 92mm objective. You shouldn't be able to notice that small an obstruction.
If it makes you feel any better, the Obie BT100 is reported to be operating at 91-92mm according to a couple of member's measurements. True aperture thread
Best regards,
Rich V
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Binoculars:
33/50/75/150x100 Saturn III, 16x70 FMT-SX, 10x50 PCF-V, 10x43 DCF-SP, 10x35 E2, 7x35 E, 8x30 E2, 7x26 Custom, 8x23AS Diplomat, 8x23 Travelite
Scopes:
C9.25, 6" f8 reflector, SV80S
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medinabrit
professor emeritus
Reged: 10/27/04
Posts: 648
Loc: medina ohio USA.
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Yes ive found 3 in the last 2 years.
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BarrySimon615
Pooh-Bah
Reged: 03/01/04
Posts: 1279
Loc: New Orleans, LA
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Quote:
Rich V, EDZ,
Barry, nice work and her is an update on the GBT 100/45 - At eight inches back from the ep the measuremennt has been corrected to four inches reather than three. If I can help with additional measurements, please say the word.
BB
I would be curious to see still another measurement. Reason? You say above that the GT 100 measures at 4 inches not three. Keeping in mind that these are 100 mm binoculars and 4 inches is actually almost 102 mm, something is still wrong. Remeasure with binocular objectives about 4" from the "projected to" surface and with the binoculars squared to the door. Try to get several readings with the light source at 8" back from the eyepiece (at infinity) and also at about 12", 16" etc. (These readings will hopefully be the same.)
I plan to measure some of my telescopes later to see what changes occur in going from straight thru at infinity to a 1.25" diagonal and then on to a 2" diagonal. Should be interesting.
Barry Simon
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14731
Loc: Cumberland, R I , USA42N71.4W
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I agree that result should be verified.
these comments from my original post in the original thread on this simple test
Quote:
I tried this simple test this morning and found it to be quite easly performed and also quite accurate. I took out a 15x70 that I know is 63mm. I used a small bright LED white light. Actually I found there is quite a bit of leeway in the angle of the light entering and I could still easily see 63-64mm on a scale placed directly over the barrel.
One caution is the instruction to keep the light a reasonable distance back from the eyepieces. That is important. With the light right up near the eyepieces, a mistake someone might make is to tilt the light from side to side slightly. This allows you to shine the light right out to the objective edges on both sides, showing a false apparent aperture of 70mm. With the light perhaps 6" to 8" behind the objectives, I could tilt the light a little to each side and the effect was to "move" the 63mm projected circle across my scale.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Hi everyone,
I will recheck my measurements later today and report my findings.
BB
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Here we go again,
Here are the latest numbers and their are a few of them.
First, I put a white sheet of 8 1/2" by 11" paper on a wall and kept the front of the right tube 8 1/2" away from the paper. With the focuser all the way in and the ep out, I placed the flash light right against the focuser and the full circle measured 4 1/4" in D. With the focuser all the way out the measurement was 4 1/8"
I then placed a 20mm ep into the focuser and performed the same test with the flash light at 8" away and again at 16". Here are my measurements:
Please refere to the picture provided by Rich V, because the circle did not reach a full circle. With the focuser all the way in and the flash light at 8" the measurement was 3 3/4". With the flash light at 16" the measurement was 3 1/2". These numbers held true with the focuser all the way out.
I hope this helps
BB
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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Bill, I was hoping EdZ or Barry would respond before me because I don't get why you get a 3.75" circle with the light at 8" but a 3.5" circle with the light held at 16". I've tried the same distances with my Miyauchis and the projected circle doesn't change a bit whether the light is held at 6" or even 24". Only the brightness of the circle changes, as expected.
I can only guess, then, at your actual effective aperture. 3.5"=89mm and 3.75"=95mm so your GTB is somewhere in that range. If you calculate the segment areas that are missing from the circle on the one side based on the images provided by planet-beaver in the above linked thread, then you have approx. an additional 15% light loss making the effective aperture of the obstructed side somewhere in the 82mm to 87.5mm range.
That's about the best I can make of it. Thank your wife for being so patient! 
Rich V
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Binoculars:
33/50/75/150x100 Saturn III, 16x70 FMT-SX, 10x50 PCF-V, 10x43 DCF-SP, 10x35 E2, 7x35 E, 8x30 E2, 7x26 Custom, 8x23AS Diplomat, 8x23 Travelite
Scopes:
C9.25, 6" f8 reflector, SV80S
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medinabrit
professor emeritus
Reged: 10/27/04
Posts: 648
Loc: medina ohio USA.
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Heh you guys .Try looking out of the small end .Its much more enjoyable.Ha Ha.
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1393
Loc: Carson Valley, Nevada, USA
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I hear you, Brian, sometimes these complexities just get out of control!
A night under the stars puts it all back into perspective.
Rich V
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Brian,
Funny, however last night was a total rainout and the Rangerss lost, not a star in the night sky with the exception of my falslight.
Rich V. I'm sure that EDZ and Barry will respond in due time. Did you try the flash light with the focuser all the way in and then all the way out?
Also Glen M has the GBT 100/45 as well and we should ask him
if he could check the numbers as well.
Brian, do you have a flash light that you would like to try?.
A light loss of between 18mm and 12.5mm is something that needs to be further verified by others.
My wife Gerry gets her reward today for helping me this kind of fun project. She gets to shop most of the day today with my one and only 31 year old daughter Laura. Shop till you drop.
BB
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medinabrit
professor emeritus
Reged: 10/27/04
Posts: 648
Loc: medina ohio USA.
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Actually i am the same with flashlights as i am with Scopes & binos Must have at least a dozen.
But im off to France in the morning so flashlight games will have to wait.
Had beautiful clear sky here this morning .
Got some great views of the half moon.
Brian.
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 506
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Thanks B for the quick response and enjoy your trip to France. Hope you get to see Kenny along the way.
With so many bins and telescopes, the flashlight games would reveal some interesting findings especialy with your GBT 100/45.
Enjoy the trip and the wine.
BB
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Erik D
Post Laureate
Reged: 04/28/03
Posts: 3196
Loc: Central New Jersey, USA
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Quote:
Actually i am the same with flashlights as i am with Scopes & binos Must have at least a dozen.
Brian.
That statement brought a smile to my face. Some of us on this forum seem to have the same affliction. Mine was with maglites. Let's see, I had the 2 AA, 2 AAA, 1 AAA, 2 C, 7C, 4D, 6 D. I use to order 2 AAA mag lights by the dozen and give them away for the holidays. I must have had every color 2 AAA mag lite ever made. Use to mix and match green and red for Xmas. ;-))
I have no intention of starting an LED collection. No way....
ERik D
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