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Thanks Jeff and Scott and Peter. Jeff the vignetting is caused by the 2 inch nose piece (48mm ID) going into the Astro Physics 2.7 inch focuser. I am getting an adapter made which will get me at least 55mm clear aperture to the 52mm filters close to the camera. In order to get the correct (0.75) focal reduction with the AP FR/FF I use Borg bits between the camera and the AP focuser. The bottle neck is the 2" nose piece.
Virginity and perfection I will leave to others to pursue. I just do the best I can with what I have got.
Scott that is a dark frame with the ICNR set to ON. See how well ICNR works.
Peter the distance between the camera and the AP FR/FF was varied to get the flattest distortion free field with the 100ED. Guess what, it was best at a focal reduction of 0.744.
Bert
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