That would be an interesting pair-up. The Celestron, being a
Schmidt-Cassegrain design, should have a leg up on the Questar as
regards coma since the Questar (like most small mirror lenses) is a
Maksutov design. However, Celestron is a mass-market producer relative
to Questar. Final finish and QC might trump the design advantage. Of
course, coma is a function of fast optics so the superior design of the
Celestron would already be under stress from the Questar being a slower
optic. The Celestron should also suffer more from diffraction being a
faster optic with a larger central obstruction.
So, who has a Celestron 750mm f/6? I wish I did. My only Celestron is
2000mm f/10. I think the 750 f/6 probably hasn't been made for 30 years.
Chuck Norcutt
usher99@xxxxxxx wrote:
> Wonder about relative performance compared to the Celestron 750 F6.
> Focusing at F8 might be a challenge.
> Mike
>
>
>
> Ugly.
>
> But I recall that that lens is quite the performer. My spending
> priorities
> are elsewhere, but that price is reasonable considering the quality of
> the
> lens--minus the broken parts, of course.
>
> AG
>
>
--
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