I am interested in purchasing TEC 0.9x Focal Reducer Corrector (FRC) to image with my 160FL APO scope. Anyone else image with TEC 0.9x FRC and is 115mm back focus consistent?
Also, what is the field correction size for TEC 0.9x FRC? I understand the field correction size (or imaging circle) for TEC FF is about 51mm, is TEC 0.9x FRC field correction about the same size or a little smaller than TEC FF? My camera is QHY 600M-PH which uses a full frame sensor at 36mm x 24mm (43mm diagonal).
I am a little fed up dealing with a ridiculous short back focus of 78mm with TEC FF and 160FL scope. This TEC FF is really good and gives a pretty flat field image at 78mm back focus but it's difficult to meet a short back focus distance of 78mm with the imaging train equipment I'm interested in purchasing like Optec Sagitta OAG and QHY CFW3 filter wheel.