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Erik D
Post Laureate
Reged: 04/28/03
Posts: 3196
Loc: Central New Jersey, USA
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Hi Pier,
Thanks very much for your link to the 150mm deg Ultras. Wow!
Do you have access to a pair currently? If so I would like to know how does the fork mount attach to the tripod? Is it a 3/8 inch-16 threaded bolt, a 5/8-11 or some other mounting arrangement?
Erik D
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GLR GROUP
super member
Reged: 03/22/04
Posts: 196
Loc: Cugliate Fabiasco,(VA) (ITALY)
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Hi Erik, I "should try "these binoculars at the end of October. I think to write a preview and to make a small movie with my camcorder, I'll published all on my website.
best regards
Pier
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[url] www.binomania.it [/url] you can find many binoculars reviews!
[url] www.landscapephotography.it [/url] a tribute to italian and switzerland landscapes
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Georgeo
newbie
Reged: 01/05/09
Posts: 2
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I'm new to the group and I'm curious about the optical quality of the General hi-t 150mm binocular with interchangeable eyepieces. Has anyone looked through them and if so how is the viewing quality on deep sky objects?
Georgeo
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Erik D
Post Laureate
Reged: 04/28/03
Posts: 3196
Loc: Central New Jersey, USA
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Georgeo,
A warm welcome to Cloudy Nights.
I am quite interested in learning more about the BT 150mm but I have not seen any report of sighting by any user in the USA on this or any other forum.
Given that the optical system is 150mm ~F 5.5 achromat I would expect false color to be readily visible.
I would love to own such a binocular but at 21 kg/46 lbs I think it would be a project to set up each time. I am familiar with the effort required to hoist and mount a 30 lb telescope. This monster weighs half again more!
ERik D
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BobinKy
Carpal Tunnel
Reged: 04/27/07
Posts: 1683
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Pier--
I really like your landscape photography--particularly "Placet Omen" in the Mountain series.
Thank you for posting a link in your signature.
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Bob
38°N
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boydd
sage
Reged: 12/07/07
Posts: 237
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If we are going to use the word telescope then the focuser should be 90*. Telescopers use 90* for a reason in astronomy. Straight through and 45* is great for daytime. Two uses, two scopes. One can make anything work for ones individual purpose. Several folks skillfully demonstrate this (EdZ/Mr.Bill) but are several deviations away from the norm.
How about a 45* and 90* version?
#46 is too heavy at any price.
Please do not hijack the thread with a never ending debate on 90* vs 45*.
Dave Boyd
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Gordon Rayner
scholastic sledgehammer
Reged: 03/24/07
Posts: 967
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??The Fuji right angle 25 x 150 weighed about 65 pounds. I used it many times while demonstrating, and while heavy, it was not a crisis to handle. The current straight and 45 deg versions are about 45 pounds. I do not see any way that weight could be significantly reduced without serious compromise of integrity and/or cost. Perhaps the use of titanium fasteners might shave off a tiny bit, but would not be cost effective. Perhaps magnesium body? But probably corrosion problem in marine use, though modern formulations claim to have greatly reduced that problem. But thermal expansion is higher, and cost would also be higher.
With the use of mirrors,instead of prisms, the deviation angle can be extended from perhaps 70 deg. to 110, 120, 135, 150, or whatever one wants, up to 180 deg., which would be nearly ideal for the zenith. The beamprints on the mirrors become less elongated as the total deviation angle increases. See what I wrote in the 200 mm. Macau thread. Erect, unreversed images are retained . One might want to lie on the binocular in some configurations, if one wanted to view the object in the same way as usually depicted in books, or for terrestrial use. But remember that southern hemisphere observers see northern objects inverted from the usual perspective of northern observers, and vice versa.
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Erik D
Post Laureate
Reged: 04/28/03
Posts: 3196
Loc: Central New Jersey, USA
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Most able bodied adult males should be able to hoist 40 to 50 lbs to shoulder height without much difficulty. Setting it up on a regular basis on frigid nights when we our schedule only permits a 30 min window to observe is a different story.
I use my 20X80 LW binocular with straight thru EP much more often than my Miyacuhi 100mm F7.5 with 45 deg EP. We hear many complaints about using giant binos without straight EPs for astronomy, but I think the number of CN members using 15X70, 20X80 and 25X 100 with straight EP FAR out number owners of angled binoculars.
Using 45 deg angled binos for astronomy is nice. 90 deg is NOT a must for ME.
ERik D
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Joe Ogiba
Post Laureate
Reged: 02/14/02
Posts: 4069
Loc: NJ USA
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Quote:
Using 45 deg angled binos for astronomy is nice. 90 deg is NOT a must.
If you compare a 45° vs 90° diagonal on a scope for astro use you will see why almost all use the 90° version.
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Pentax PF-80ED,Meade 102ED APO,Orion EON 72,120ST
Apex 127,C6 XLT,CR150,C9.25,XT10
Zeiss 7x42 FL,Canon 10x42L IS WP,15x50 IS
12x36 IS II
Garrett Optical 28x110 HD-WP Signature Series
Oberwerk BT-80 45, Apogee RA-88-SA
Denk II Power x Switch binoviewer w/13mm Ethos, 20mm Pentax XW's, 20mm Widescan III's.
17mm Ethos, 22mm Nagler, 40mm Pentax XW, 14mm Pentax XL, 5.2mm Pentax XL, 8-24mm Pentax XL Zoom
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CESDewar
GorillAstronomer
Reged: 01/16/05
Posts: 2069
Loc: Morganton, GA, USA
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I'm definitely inclined to agree with Erik when it comes to 45° vs. 90° binoculars. I find that 45° works fine in almost all cases - yes, perhaps right near the Zenith the 90's would have an advantage, but I also like viewing in the general direction of where I'm observing, as opposed to viewing at a 90° right-angle.
Like Erik, I have Saturn III's and on many nights I'll just take my 30x77mm Exceeds out instead - at some 5.5lbs (vs. 13lbs) and on a correspondingly lighter mount, I find I get 80-90% of the viewing pleasure with a setup that goes out, binos, mount, and tripod, all held with one hand. And that kind of spontaneity is what binocular observing is all about. Certainly the Saturn III's outperform the Exceeds, but it's double the weight and gets carried out in two pieces, vs. one. And on many nights even the Exceeds succumb to the Canon 18x50's which require no mount at all and can provide remarkable views for a quick 5min. foray outside when the temps are better suited to Polar bears than Astronomers. 
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Andresin150
sage
Reged: 08/14/07
Posts: 305
Loc: Bogotá - La Calera / Colombia
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I wrote 2 weeks ago to the Chinese factory that makes the "new" giant BA6 150mm binoculars and asked them for their price and here is what they wrote to me yesterday:
Dear Andres,
This 25x150 binoculars FOB price is USD2600, including one set of eyepiece, hard case, tripod and U fork mount. And our minimum order quantity for mass order is 3 pieces.
Thanks,
Kevin Zhou
So here in Colombia I have no partners to buy 3, but if interested, 3 of you in the States could probably buy them in company...
At that price, sure they are non ED and semiapos, but reading the specs they look good enough, specially good eye relief and 45º eps, whit tripod, fork mount,... If I knew that I could sell them here, probably I´ll buy the 3, but not too many comet hunters here in Colombia...
Still keeping strong desire for my "future" 150 Fujis....
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25x150 MT
30-50x120's
Ultra 15x70's
GOTO NEX Planetarium
1 Macaw, 1 Toucan, 1 parrot and many other little ones...
And the nicest greenhouse!
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