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Paul,
can I suggest you try different eyepieces.
At first glance it looks like the bino viewer is giving you excessive eye relief, but I find this hard to swallow. Do the 40's give a similar eye relief when used sans the bino?
Correct me if I am wrong, but the lightpath within the bino viewer is merely like the lightpath within an OTA, correct?? If so, how come the eye relief changes??
Maybe this is whay I am so happy with the 20mm Erfles.
Gary
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