Itz marcus
Pooh-Bah
Reged: 02/12/06
Posts: 1073
Loc: Brooklyn NY
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Hi,
I'd like to do high power planetary viewing. Which of the two would you suggest, 11mm tv plossls or 12mm uo ortho volcano top? Both would provide around 150x since I have to use the supplied 2x adapter.
Any other suggestions are welcome although, I am looking into these for now.
Thanx
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Eon 120 ED 
Stellarvue bv3
Gas is only worth it in the stars not at the pump
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Jay_Bird
Pooh-Bah
Reged: 01/04/06
Posts: 1493
Loc: Nevada, USA 36N 115W
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I only know the TV Plossls by their excellent reputation.
For one-eyed views I'm always impressed by 9mm UO older (volcano-top) orthoscopic and 12.5mm Ultima, with 80mm f/6 and barlows.
Just a thought - Sirius Plossls, mentioned by virtue of Orion's customer service just in case you should have any trouble with them for BV use. They are solid performers and good value, although not quite as nice or FMC as the ones you listed.
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'these things stand like stone - kindness in another's troubles, courage in your own' Gordon
C-8, SV80 & C102 achros, 6" Newt, Porta & GEM, Lunt 35; Binoculars 21mm-80mm & p-gram
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Jim Rosenstock
Postmaster
Reged: 07/14/05
Posts: 6543
Loc: MD, south of the DC Nebula
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Quote:
Hi,
I'd like to do high power planetary viewing. Which of the two would you suggest, 11mm tv plossls or 12mm uo ortho volcano top?
I enthusiastically recommend the UO 12.5mm orthos for binoviewer work, especially for Lunar and planets. Very crisp.
Not that there is anything wrong with TV plossls, of course. TV is the "benchmark" brand for plossl eyepieces, and will give you pleasing views as well. One-eyed, you might appreciate the slightly wider field of view of the plossls, but to me at least, the ortho field of view is just fine for binoviewers, and for planets I'd expect them to be a hair sharper, and slightly less expensive, too.
Just my $.02....but either choice should make you very happy.
Clear skies,
Jim
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QUESTION AUTHORITY!
"errr....sez who??"
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jimandlaura26
sage
Reged: 11/19/03
Posts: 229
Loc: Northern VA
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See my post in "How much does FOV matter in BVing"
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Jim M.
Northern VA (NOVAC member)
Stellarvue 70ED & Celestron SLT mount
Stellarvue 80ED & Stellarvue M-2 alt/az mount
Stellarvue 80S & Celestron ASGT GEM
Stellarvue 102A & Discmounts DM-6 alt/az mount
Celestron C8-XLT & Celestron CGEM
Coronado PST & Stellarvue M-1 alt/az mount
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Monroe
member
Reged: 11/10/06
Posts: 10
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Out of interest, for this particular scope (the 100ED)/BV3 combination, is a 9 mm ortho getting just too short in FL? I'm just starting to get my head around the optical considerations of bino's. thanks
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David E
Post Laureate
Reged: 05/25/06
Posts: 4177
Loc: North Carolina
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Personally, for a "budget" pair I'm partial to the Orion ED Epic's (or Celestron X-Cell). More field of view and eye relief would be appreciated I think but YMMV of course. If you want to stick to your original choices, I'd get the type that you are already familiar with and comfortable using. I could be wrong but I doubt you would see any significant difference in image quality between the two, using them in import binoviewers.
David E
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jack45
Post Laureate
Reged: 07/07/03
Posts: 3098
Loc: Lacey WA
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You can try the 5000s Meade Plossls,9mm,14mm,20mm or 26mm. There 60 deg FOV and good ER with a nice clean Image. About $59.00 used and $99.00 new! I have the 26mm,14mm and may get the 20mm. The UO are best for detail viewing, I'm looking at getting the 18mm and 12.5mm UO pair. The binoviewer can make a bad ep into a nice pair!
Clear Skies!
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Discovery 16"f/4.5, XT12"Orion F/4.9 & Discovery 12.5"f/5.0
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backwoody
Pooh-Bah
Reged: 01/08/07
Posts: 1237
Loc: Idaho USA
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You might take a look at a pair of 8.5mm Pentax XFs. Compact size is ideal for binoviewers; images are high-contrast and tack sharp. I use one cyclops-style.
Last time I checked, price was about $150 each...
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woody
a parsec farther out...
12.5" f/4.8 custom truss dob, EQ platform
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CESDewar
GorillAstronomer
Reged: 01/16/05
Posts: 2085
Loc: Blue Ridge, GA, USA
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If your budget can stretch to the Pentax XF's, I would agree they would be an excellent choice, but that's a big stretch over the Orthos.
The Pentax XF's are Light-weight, 60° FOV with good eye relief and superb optics - on-axis sharpness is about as good as anything I've seen and with excellent contrast. I use both the 8.5 and 12mm XF's in my SV BV3 binoviewer and the quality is breathtaking. But if you can live with the narrower FOV and smaller ER of the UO Orthos, the on-axis sharpness would be comparable and you would have them for $120/pr. vs. $320/pr, and that $200 could surely be best spent elsewhere on something that would bring more to the table....
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 18806
Loc: Cumberland, R I , USA42N71.4W
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Is your SVP ED100 an f/9 scope???
BTW, the Stellervue SV B3 ocs has a factor of 2.26x in refractors.
So figure it out from there.
Your effective focal length with the binoviewer is 2034mm.
With a 12mm ep, you are getting a magnification of 170x.
11mm = 185x
9mm = 226x, IMO, out of reasonable range for this BV
You would effectively be turning your scope in a 70mm pair of binoculars and you are trying to use them at 170x. Frankly in my opinion you are grossly overtaxing the system to do something for which it wasn't designed. If I were you I would back off to eyepieces in the range of 14-15mm for your high power.
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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David E
Post Laureate
Reged: 05/25/06
Posts: 4177
Loc: North Carolina
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Quote:
Is your SVP ED100 an f/9 scope???
BTW, the Stellervue SV B3 ocs has a factor of 2.26x in refractors.
So figure it out from there.
Your effective focal length with the binoviewer is 2034mm.
With a 12mm ep, you are getting a magnification of 170x.
11mm = 185x
9mm = 226x, IMO, out of reasonable range for this BV
You would effectively be turning your scope in a 70mm pair of binoculars and you are trying to use them at 170x. Frankly in my opinion you are grossly overtaxing the system to do something for which it wasn't designed. If I were you I would back off to eyepieces in the range of 14-15mm for your high power.
edz
Although I have successfully used 200x with my old Stellarvue BV1's I have to agree with EdZ's advice here. I find a power range in the 130-150x to be much more usefull than the 200+ range in my import binoviewers. If I had never purchased my 200x pair, I doubt that I would have missed much. By the time I get over 200x, switching to one eyepiece is just a better solution.
David E
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David E
The funniest thing about this message is that by the time you realize it doesn't say anything, its too late for you to stop reading it.
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jack45
Post Laureate
Reged: 07/07/03
Posts: 3098
Loc: Lacey WA
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I just tried out a pair of 26mm Meade 5000s eps, again! Using the New Burgess 24mm CA binoviewer. Great job Burgess on style and simplicity! They work very good and user friendly. Also used a pair of 14mm Meade 5000s and the 20mm given by Burgess! The moon looked great with lots of detail-sharp-clear image!
The new Burgess binoviewer is a very good deal! You need to try one to see what I mean! The 24mm CA does is job, with the 5000s 26mm ep. The mountains on the Moon showed lots of detail! I used an Orion XT12" and good collimation aways!
Note: I also used the Burgess binoviewer with my 12.5"Discovery and had no problems at all!
Clear Skies!
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Discovery 16"f/4.5, XT12"Orion F/4.9 & Discovery 12.5"f/5.0
Edited by jack45 (11/19/07 10:35 PM)
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midnite4blues
professor emeritus
Reged: 11/21/05
Posts: 523
Loc: Denville, NJ
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jack45, can you comment on the edge correction of the 14mm Meades in bino mode with your fast scopes? I have been considering these for a while now due to the wider fov and longer eye relief than the 15mm TV Plossls, but I've heard mixed reviews on the edge correction with fast scopes.
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Ted
Sheep Hill Astronomical Association - Boonton, NJ
Sheep Hill Observatory, 18" f/4.5 newtonian
Orion 180mm Mak-Cass
Celestron C6R
Orion SpaceProbe 130ST
Celestron Onyx 80 EDF
Lunt LS60THa/PT/B1200/C
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jack45
Post Laureate
Reged: 07/07/03
Posts: 3098
Loc: Lacey WA
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They work for me and I'm no expert! I like the clear images I get from using these eps. The ER is also good for a 14mm ep. I'll check that out as soon as it clear up (edge correction)!
Clear Skies!
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Discovery 16"f/4.5, XT12"Orion F/4.9 & Discovery 12.5"f/5.0
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David E
Post Laureate
Reged: 05/25/06
Posts: 4177
Loc: North Carolina
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Quote:
They work for me and I'm no expert! I like the clear images I get from using these eps. The ER is also good for a 14mm ep. I'll check that out as soon as it clear up (edge correction)!
Clear Skies!
I have a pair of Meade 5K 6.7mm UWA's. Now, depending on the scope your have, these might produce too much power, but in my short refractors they work great IMO.
David E
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David E
The funniest thing about this message is that by the time you realize it doesn't say anything, its too late for you to stop reading it.
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Dave Hederich
sage
Reged: 09/12/07
Posts: 396
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Are you presently using the SV 23mm EPs that come with the BV3? You can get a taste of higher power by using the 2x adapter ahead of the diagonal, where you should get something in the 3x-4x range. The viewing quality might not be as good as with higher quality EPs, but at least you would get an idea of what the higher magnification would look like.
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Celestron C4-R 102mm f/9.8 Achromat + GSO 2" Dielectric Diagonal
Tasco StarGuide 4 102mm f/13 Mak + NexStar 60GT Mount
Orion ST80 f/5 Achromat
Stellarvue BV3 Binoviewer + Burgess 1.9X OCA + SV23mm EPs
GSO 1.25" & Astro-Tech 2" 2X Barlows
Astro-Tech 38mm Titan, Orion 9mm & 20mm Expanse
Pentax 20x60 PCF WP II Binocular
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Mike Holland
Pooh-Bah
Reged: 12/22/06
Posts: 1264
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Quote:
Are you presently using the SV 23mm EPs that come with the BV3? You can get a taste of higher power by using the 2x adapter ahead of the diagonal, where you should get something in the 3x-4x range. The viewing quality might not be as good as with higher quality EPs, but at least you would get an idea of what the higher magnification would look like.
When I first received my Stellarvue BV3, I was frustrated because I couldn't get my NP-101 to come to focus using the binoviewer adapter that came with it, or with a 2x barlow. Vic Maris at Stellarvue was stumped, and Tele Vue had no clue. Hence, I put it aside.
When I got the Tele Vue 3x barlow this week I tried to use it with the BV3 and 23mm eyepieces just in case, and WHOA! It came to an incredibly sharp focus at high power. My floaters were gone! This was my first taste of binoviewing, and the 3D look of the lunar limb was mesmerizing. I may not use my high power eyepieces anymore.
I would appreciate it if some math wiz can help me figure out the power level of a BV3 with the 23mm eyepieces and a Tele Vue 3x barlow (it's very LONG) in my 540mm focal length scope. It definitely doesn't look like it's 70x (540/23 x 3)--it's much higher. Thanks!
Mike
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SV80ED Raptor/NP-101/SV 110ED/Gibraltar/Vixen GP Mount/Losmandy GM-8/Astro-Physics Tripod/Naglers, Panoptics, and Radians
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Optiphile [OP-teh-FILE] -noun, one who appreciates or obsesses over fine optical equipment, generally telescopes, binoculars, binoviewers, or photographic lenses.
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Jim Rosenstock
Postmaster
Reged: 07/14/05
Posts: 6543
Loc: MD, south of the DC Nebula
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Quote:
I would appreciate it if some math wiz can help me figure out the power level of a BV3 with the 23mm eyepieces and a Tele Vue 3x barlow (it's very LONG) in my 540mm focal length scope. It definitely doesn't look like it's 70x (540/23 x 3)--it's much higher. Thanks!
Mike
A math whiz won't help....you'll need to determine the actual power yourself, in the field. A barlow's stated power is nominal....it can vary depending on things like spacing, and what optics are in front and behind. Obviously, with your combination of equipment, you're not getting the magnification that the basic arithmetic would suggest.
If you're sure of the AFOV of your eyepieces, then timing how long it takes a known star to drift through the center of the FOV will allow an accurate calculation:
http://home.earthlink.net/~haggisizing/astro/ep-af-test.htm
Clear skies,
Jim
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QUESTION AUTHORITY!
"errr....sez who??"
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Mike Holland
Pooh-Bah
Reged: 12/22/06
Posts: 1264
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Thanks for the response.
Mike
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SV80ED Raptor/NP-101/SV 110ED/Gibraltar/Vixen GP Mount/Losmandy GM-8/Astro-Physics Tripod/Naglers, Panoptics, and Radians
_______________________________________________
Optiphile [OP-teh-FILE] -noun, one who appreciates or obsesses over fine optical equipment, generally telescopes, binoculars, binoviewers, or photographic lenses.
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 18806
Loc: Cumberland, R I , USA42N71.4W
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Quote:
If you're sure of the AFOV of your eyepieces, then timing how long it takes a known star to drift through the center of the FOV will allow an accurate calculation:
ONLY for eyepieces that don't vignette. So don't use eyepieces with wide field stops. Use something maybe 23mm or smaller. Drift time the eyepiece without the BV, then drift time the eyepiece in the BV and barlow. dividing the fovs gives you the power factor.
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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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