Chuck Norcutt wrote:
> ... For telescopes of 90mm diameter or less the overwhelming design choice
> is a Maksutov which uses a spherical primary and a very thick meniscus
> corrector lens. This is your typical camera mirror lens design which (if
> it's done correctly) can have the secondary mirror simply be an aluminized
> spot on the back side of the Maksutov corrector lens.
That is the design of my Meade 90mm diameter, 1000mm fl, F11 telescope.
> .....................
> .... They are true telescopes with secondary mirrors sized for visual use...
> meaning a small image circle. Probably OK on an E-body but with some evident
> vignetting on 35mm size.
The Meade I have does not vignette. With focal length and aperture
marked prominently on the front ring, it is probably designed for camera
use as well as telescope use.
> But it will be equipped with a finder and means for sturdy mounting and have
> options for removal of the visual
> back and replacment with a larger focusing tube and T-mount for a camera.
>
Yup. Both brands require an adapter that screws onto the body with
eyepiece attachment removed and has the back end threaded for T mount
adapter for the particular camera.
Moose
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