I am about to pull the trigger and buy a TS-Optics 65mm astrograph. It is an F/4.5 - 5 element APO with integrated corrector. The correct distance to the sensor plane is 55mm from the rear M48 port. I intend to put a filter drawer between the corrector and the camera. I basically have two questions regarding the filters and its placement:
-1.25' or 2' filters for a ZWO 183, a ZWO 294 and for APS-C sensor? How much of a liability would 1.25 filters be?
-Regarding the filter placement, TS has suggested buying a filter drawer with an M48 thread so it could be screwed directly to the corrector, then T2 extensions to complete the 55mm to the sensor. My questions is: is it important where you put the filters in the image train, and would it be better to put the filters closer to the camera (if it makes a difference at all)?
Thanks all for your kind input.