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These might even serve as binocular "doubler" if you held them up behind the eyepieces of a large tripod mounted binocular?

Dave

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The field of view offered by this combination would most probably be awfully small, much less than the front binocular's apparent field. In a Galilean system the entrance pupil is still the eye, which here would be quite far behind the big bino's exit pupil.

The best auxilliary scope would therefore be one with a positive eyepiece, because then the entrance pupil will be the objective itself, which can be placed properly in plane with the front bino's exit pupil. This will allow to see an image across the aux 'scope's full field, and not just a small part in the center. And of course, for right side up viewing, the auxilliary 'scope would need an erecting system, which is what increases the cost considerably.

Of course, the preceding babble is based on what limited knowledge I have. As there is nothing as authoritative as doing, I'll try this out and report back...

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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV

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