Jeff Keller ha scritto:
> I find the 500mm f8 lenses hard to focus. The focal length + f8 aperture
> limit it to a few focus screens (1-8, 1-7, 2-4 in my experience) Celestron
> has a 750mm f6 that is much easier but also bigger but still light weight.
I'm afarid that the Celestron has an odd focusing mechanism. Is it a normal
ring or something different?
Luca
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