Quote:
Originally Posted by Straylight
Is there a way to work out where the focal point is mathematically? I can supply the specs if someone wants to work it out.
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I'm not sure about mathematically - probably there is, but I don't know how. But you could work it out by taking off the focuser, and moving your DSLR closer to the secondary until you find the point that it's in focus.
Does your dob have tracking?
What sort of photography did you want to do?