I am seeing a good deal of vignetting from the pick-off prism of my Astrodon Monster MOAG on my system. Please see the attached example.
I have the following equipment:
AG Optical iDK 12.5” telescope
Optec Gemini rotator/focuser
Astrodon MMOAG off-axis guider
Lodestar CCD guide camera
FLI PL-16803 CCD camera
FLI CFW-5-7 filter wheel
I see that Astrodon (now Farpoint) sells prism spacers, but they are meant to move the prism further into the light path.
Has anyone dealt with this problem? Is there a way to move the prism further out of the light path?