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Old 07-06-2020, 10:22 AM
Sitt (Simon)
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Sitt is offline
Join Date: Jul 2007
Location: Perth
Posts: 39
Camera is a ZWO ASI 533 MC Pro, the width of the Celestron OAG is around 45mm.
If I used 75mm back focus then I can't get focus on an object around 1km away - I know 1km is not as far as a star when comparing distance but surely I should be able to get focus on something as close as 1km?

* Corrected size of OAG (depending on what adapters are used will affect size)

Last edited by Sitt; 07-06-2020 at 11:33 AM.
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