Re: ATM Large-format focus devices

[Andy Saulietis <iss@pvtnetworks.net>]

Kevin writes:

>I played around with field sizes for the cass and greg section of my scope
optics.
>It appears that I can use a large focuser, say 3" diameter. 
>I know of no eyepieces that have this large format. 

Our NASA C-16 came with a 3" dia (field size) & 75mm fl Erfle
eyepiece..it was mil surplus & apparently used to view a small
radar screen in an aircraft. The eye relied with the C-16 was
about 2" which made it difficult to keep your eye centered.

It gave ~60X with a 60 deg app fov..the correction was not
very good. Weighed about 10 lbs with a built in helical focuser
& metal bellows dust seal.


Andy Saulietis
ISS Enterprises
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Mayhill NM 88339


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