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Ken,

I would suggest that the combination of your eye and your sextant
telescope are focused on infinity, whereas Jim's is focused on his
horizon mirror. That would explain the difference between what each of
you sees.

It may be a matter of the focus control on your telescopes, the depths
of field of your 'scopes, or one of Jim's eyes being better at focusing
on close objects. Most likely, all three factors are in play.


Trevor Kenchington


You wrote:

>>I repeated the experiment, this time blocking the horizon mirror's
>>clear window from the front.  Not surprisingly I guess, for all 3
>>sighting devices (sight tube, 4.5x30 and 6x40 telescopes) I only saw
>>the index mirror's image in the right half of the field of view, and
>>it stopped sharply at the center of the field of view where the
>>vertical edge of the mirror ended.
>>
>
> This is surprising. When I block my horizon mirror's clear window from
> the front (leaving the mirrored half unblocked), I see the index mirror's
> image across the entire field of view with a 5x36 scope.




--
Trevor J. Kenchington PhD                         Gadus@iStar.ca
Gadus Associates,                                 Office(902) 889-9250
R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
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