harbinjer
super member
Reged: 12/17/08
Posts: 126
Loc: Southeastern Minnesota
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Has anyone seen or used such a binocular? One recently went on the bay for a decent price, was anyone here the lucky winner? I am interested in something similar and I'd be curious if I should include or exclude this in the future?
I'm also curious if its close to the advertised specs, and more importantly how much of the FOV is sharp, and if the contrast is decent(for its class).
the number was 180417463198 is you want a look.
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14731
Loc: Cumberland, R I , USA42N71.4W
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Well, to get to those specs, it would need to have an eyepiece with a 30mm field stop and it would need 30mm wide prism aperture. That would make it one of the largest small binocular prisms in existence.
The only binocular I know of that has a 30mm wide prism is the Oberwerk BT100. IIRC, they are 32mm.
Of course, it could have the field stop (look for eyepieces larger than those on the Fujinon 10x50), but not the full prism, which means it definitely darkenes the outer fov and it might vignette the aperture.
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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harbinjer
super member
Reged: 12/17/08
Posts: 126
Loc: Southeastern Minnesota
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When you say 30mm wide, is that across the widest side? (its a trapezoid,when seen from the side?)
The prisms and eyepieces look big, but probably not quite big enough. If it does vignette the aperture, is that the cause of the darkening in the outer FOV? Or rather is that one cause of it? Is the darkening probably fairly subtle, especially when concentrating on axis?
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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Quote:
Has anyone seen or used such a binocular? One recently went on the bay for a decent price, was anyone here the lucky winner? I am interested in something similar and I'd be curious if I should include or exclude this in the future?
I'm also curious if its close to the advertised specs, and more importantly how much of the FOV is sharp, and if the contrast is decent(for its class).
Yep! I was fortunate to acquire a nice pair, slightly in need of cleaning and collimation- I sent it to Cory Suddarth- Suddarth Optical Repair (who, incidentally is a big fan of these)... These are really nice bino's for what they are. BTW, 657'@1000= (657/52.5) 12.514*.
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Wes
Atlantic Beach, FL
Some bino’s from Miyauchi 5x32 Binon's up through Garrett 20x110 Signature's,
Some telescopes from a Stellarvue 80mm NHNG up through a couple of 8” reflectors…
And a wonderful 4.25" Delmarva Shiefspiegler!
Some good friends, made here on C/N.
Oh- several cats and a wonderful wife!
Anyone want a cat???? :-O
"When your work speaks for itself- Don't Interrupt" -Gamble Rogers
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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Other side...
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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No... the eyepieces are not quite as large as the Fuji 10x50- but close! Fuji's lens dia (exposed)= 1.21", Sears= 1.10". only .11" smaller. Actually, when I first looked at the two together, I thought they were closer than that. Sorry, I'm not taking them apart to take any internal dimensions! Perhaps someone else (like Cory!) has- sorry for the poor picture quality on some of these...
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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Exit pupil is round, with no cutoff..
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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Round here, too.... again, my photography is not the best- but the exit pupil above is indeed round, and there is no intrusion looking the other way!
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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And what other binoculars have their own owners namecard in them??? 
Viewing through them is really nice. There is some light falloff on the right edge of both sides, perhaps the outer 10% edge but it's not objectionable in light of how wonderful a 12.5* fov is. Don't expect them to give you the brilliance across the entire FOV as a pair of Swar's or Nikon SE's... that's not what these are. What they are are a pair that give you a hugely wide FOV. There is no rolling ball effect when scanning. I've not used them at night, but they are a pleasure to use during the daytime. It's too bad no one's making binoculars like this anymore. And to think, these used to be considered somewhat an inexpensive binocular! There are people who look down on these because of the limitations on them- or their minor optical shortcomings- but those of us who have and love these- they just don't make 'em like this anymore!
Wes
Edit: Hmmm.... Someone got a good price on them- I see they went for $76.00... hope they're in good condition/alignment! If not, I know where to send them!
Edited by Wes James (10/16/09 11:04 AM)
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Simon S
sage
Reged: 01/07/07
Posts: 389
Loc: Crawley West Sussex UK
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Please fill the lost tag in with my address and loose them Wes!
They look great?
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My binocular collection recent first
http://www.flickr.com/photos/binoculars/
My binoculars in Alphabetical order http://www.flickr.com/photos/binoculars/sets/72157613812824211/detail/
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pcad
Carpal Tunnel
Reged: 01/17/05
Posts: 1767
Loc: Connecticut
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I have the Tasco version of these with the same FOV numbers. I checked them today with a GLP. The effective aperture is a full 35mm. There is vignetting with this design but it isn't obtrusive to me. A less objective way to get a feeling for the amount of vignetting is to look through the objective lens and observe what happens to the view as the binocular is tipped. With the Tasco, the view starts getting cut off almost right away. My understanding is that this would reduce the brightness/amount of light being transmitted compared to another 7x35 12.5 fov binocular that has much larger prisms. Both would produce 5mm exit pupils, but with differant brightness. The more vignetted bino having a more signifigant drop in illumination towards the edge of the fov.
I'm unaware of any reasonably available 7x35 wide angle binocular with larger prisms than these so perhaps the point is moot.
Personally I don't mind this and these binoculars are a lot of fun to use.
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Peter
Telescopes 25 - 318 mm
Binoculars 15 - 88 mm
Microscope 50x - 1000x
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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Quote:
Please fill the lost tag in with my address and lose them Wes!
Uhhh.... Sure, Simon... sure!
Wes
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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This gets said almost every time these or similar SWA bino's are discussed... (probably by me!) It's sure a shame that some manufacturer couldn't come along and make a pair of these today- only with big enough prism's and eyepieces to give a really quality view at a wide angle such as these. They were making these in the '50's... our technology and manufacturing has improved by leaps and bounds... they should be able to improve upon these today- The Miyauchi's are fun, but they're gone...
Wes
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Simon S
sage
Reged: 01/07/07
Posts: 389
Loc: Crawley West Sussex UK
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It is surprising that some famous makers of 7x35 binoculars
suffer very noticable vignetting and yet an obscure brand models have a bright unhindered view and still use low index prisms. The Swift Triton is terrible!
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My binocular collection recent first
http://www.flickr.com/photos/binoculars/
My binoculars in Alphabetical order http://www.flickr.com/photos/binoculars/sets/72157613812824211/detail/
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harbinjer
super member
Reged: 12/17/08
Posts: 126
Loc: Southeastern Minnesota
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Thanks so much, Wes for the pictures and descriptions. Now I wish I had gone with my gut and bid more. Oh, well there will be others. And if you ever want to part with either binocular pictured, just send me a PM.
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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Well, there are usually more opportunities down the road! A collection gets made one piece at a time! When I miss out on something, I try to tell myself that perhaps I wasn't meant to have it...
.. usually doesn't help, ...but.....
Wes
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DJB
Carpal Tunnel
Reged: 02/23/05
Posts: 1589
Loc: Lisle NY
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Hi Wes,
Yes, it would be great if mfgs. made binoculars like these today--and improved. Probably expensive, maybe.
My favourite EWA binocular is a Binolux, also with beautiful round EPs. It is also a 12*+ FOV.
No matter what nameplate is on the prism cover, I believe all of these "old timers" were produced in Japan. FYI.
Best regards,
Dave.
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