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#1 JimP

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Posted 08 June 2019 - 04:12 PM

As I recall, and I hope I have this correct, the finder on a 3.5 Questar is a small round mirror which reflects up to the Eyepiece. If so, what are your thoughts about using this finder to search for double stars?

Best,

Jim

#2 JamesMStephens

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Posted 08 June 2019 - 09:25 PM

The mirror directs light to the finder objective, which has a 4" focal length.  I can't seem to find the aperture of the finder objective in any of the spec sheets, but this post estimate the diameter at 15.8 mm  https://www.cloudyni...al-information/ and estimates a limiting magnitude of 8.7.


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#3 JimP

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Posted 09 June 2019 - 05:49 PM

OK, thanks!

Jim
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