I have a Apertura 60mm FPL-53 Doublet APO and I am using the Apertura 2in FF with a Nikon D7100 dslr. The FF screws directly into the telescope and directly into a t-ring for the camera. Is there a way to use a filter with this setup?
I see my only option is to have a dslr clip-in filter but the d7100 does not support them. So am I out of luck using a FF and a filter with this setup?