#31
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Izar187 wrote: I would suggest a telescope store or a camera store that sells high end binos. I would stay away from sporting goods stores as the binos that they sell are usually Bushnell junk. One doesn't need _high end_ to get started with binos. Sporting goods retailers do sell them of course, because outdoor gear gets just as expensive as telescope gear. If it's junk, then don't buy it. Compare before buying! john One doesn't need high end, but then again, if one sticks to porro prism binocs there is a good return in performance for a rather modest price. I am something of a fan of the Swift Audubans. 8.5X44 with a really wide field and good on axis performance. The 8.5X is usefully larger than the 7x but still very hand holdable. -- Bill |
#32
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I don't worry about wasted exit pupil. The big exit pupil on the 7x50 means I
can shake and wobble a bit and my eye stays in the sweet spot. Not so for 10x50. A long eye relief model like the one on andahammer.com works well with glasses and is spectacular without - clear to the edge of the field. Also weigh well under a pound IIRC. I can weigh mine I anybody wants to know. -- Charlie Springer |
#34
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"Regnirps" wrote I don't worry about wasted exit pupil. The big exit pupil on the 7x50 means I can shake and wobble a bit and my eye stays in the sweet spot. Not so for 10x50. I agree with you in principle, but not in specifics. I have trouble staying in the sweet spot with 9x25's. With 8.5x44's and 15x70's I have no such problems with their exit pupils. Howard Lester |
#35
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The quality of binoculars varies, even within the same model. The goal of
quality control is not to make every item the same, but to make them close to some standard, so some deviance from the ideal is to be expected. Take a hundred binoculars of one particular model from one manufacturer, measure the variance in image clarity, do this for every model from every manufacturer, and you'll find the fixed power ones have more consistent quality than the variable ones. This is because it is particularly hard to make variable power optics and keep those optics in line. Not impossible, just more difficult, so binoculars in a particular price range can be made to tighter tolerances if they're fixed power rather than variable power. Yes, you're moving the optics already to focus the binoculars, but adding more moving parts to the assembly makes it harder to keep the optics in line. Also, isn't it true that in making variable power optics in general, it's harder to keep image clarity across the various powers? Something about different powers require different surfaces on the optics themselves, not just changing the distances between them? I mean, look at eyepieces. As the focal length gets shorter, the spacing between the elements of the eyepiece gets shorter, but the focal length of the various elements also gets shorter, and this requires a change in their surface curvature, doesn't it? The main telescope doesn't have to change, since it is set to a fixed focal length. -- Sincerely, --- Dave ---------------------------------------------------------------------- It don't mean a thing unless it has that certain "je ne sais quoi" Duke Ellington ---------------------------------------------------------------------- "starman" wrote in message ... wrote: Zoom binoculars have historically been optically inferior to fixed power bioculars. So the fixed power binos have always been recommended over zoom types. The same has usually held true with fixed versus zoom telescope eyepieces. Perhaps the high-end zoom eyepieces have broken the rule? Regarding allen wrenches (UK allen keys) I supopose you have noticed they are hexagonal? It seems too obvious to point out that they must be larger across the "points" than they are across the flats. Presumably deliberately laying the "handle" flat on one's cheek largely eliminates this error? ;-) Chris.B I have some Celestron 10x-30x zooms that are at least as good as my B&L 10x50 fixed ones. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
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