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Originally Posted by rmcpb
Question.
If you stand in front of these binos what stops the thermals off your body from wrecking the view? We seem to spend a lot of time eliminating the thermals in our scopes and with the binos we put a hot body right in front of them.
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Rob
Yes, I would recommend a shroud around any instrument as you can never be sure which way the breeze might be blowing.I also believe that with the reverse binocular design that each tube should have an extension hood going past the observers head, so that at most angles , heat plume from the head is directed away from and in between the two optical paths.
However , having spent some time in the past using a 20" F5 binocular , all I can say is that any occasional problems from a heat plume are on the balance overwhelmed by the advantages two discrete optical systems can give, namely 40% improved contrast and seperate seeing cells. Most larger telescopes are compromised by the atmospheric seeing a lot of the time anyway. Regardless, the brain seems to build up the best binocular image using moments of good seeing in each eye, and the view is always more detailed in both eyes than one. This selective process doesn't work with a beamslpitter viewer. When the view is lousy it is lousy in both eyes !
Mark