Quote:
Originally Posted by bojan
Yep...
It may also be a bit of wrong secondary offset...
Because the light beam reflected from primary is conical, for it to pass the secondary unaffected by vignetting, it needs to be positioned a bit away from focuser.
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You were clearly not thinking of the front UTA/OTA opening when you referenced vignetting. You were clearly referencing vignetting introduced by any secondary mirror mounted without an offset. I decided to contribute to this thread to explain this is incorrect. There are reasons when a secondary mirror offset is needed but what you have stated in the above quote is not one of these reasons.
OK, I will stop now. This exchange is becoming extremely uncomfortable.
Jason