[Tweeters] Binoculars

Dusty Bleher TweeterReader at bagithere.com
Thu Mar 9 17:57:21 PST 2017

A most excellent reply, Doug! Thank you. Knew some of that, I did. But I'd never seen it collated and presented so well. As I'd mentioned to another reply, you posed the questions I neglected to ask in my original post.

Thanks again to you and all the others that have been kind and gracious enough to reply. It's plain to see that I hang out with a great bunch of folks.

Take care and be well all,

> -----Original Message-----

> From: tweeters-bounces at mailman1.u.washington.edu [mailto:tweeters-

> bounces at mailman1.u.washington.edu] On Behalf Of Doug Will

> Sent: Thursday, March 9, 2017 13:55

> To: tweeters at u.washington.edu

> Subject: [Tweeters] Binoculars


> Dusty,


> I'd like to mention something no one else has:

> There really is no "best binoculars."


> If you are backpacking a long way, then weight is paramount.

> If you are working in low light, then light gathering power is important [larger

> front objective lens, the second number].

> If you use a tripod or are especially steady of hand, a higher power

> (magnification, the first number) may be better.

> If you are trying to follow birds in flight or flitting around, then a lower power

> with maximum field of view will matter.

> If you wear glasses, eye relief (usable distance from the back eyepiece

> lens) may make some models unusable.

> For much birding, minimum near focus distance is important.

> Finally, if like me, you have substantial peripheral astigmatism, even if it is

> corrected to first order by glasses or contacts, you may get a sharper view

> from a smaller exit pupil diameter (diameter of the cone of light exiting the

> back of the eyepiece, equal to objective diameter [1st #] divided by

> magnification [2nd #]).


> The considerations above are NOT completely independent as several are

> intimately related.

> But the caveat is that you MUST try out the optics yourself.

> Start with reviews in your price range.

> Then find stores with demo samples to look through.

> Then, perhaps, follow Josh Glant's advice to get several you think might work

> from vendors with free return policy.

> Try out your two or three favorites in various conditions for various uses.

> Finally, make your choice.


> You'll be happier with your choice if you do.

> And remember, your favorite won't be perfect in every situation, nor for

> every other person!


> Good luck getting a great pair for a good price,


> Doug Will

> Senior Research Engineer

> UW

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