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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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