choi jong min

Hi. May I know the meaning that you told 'not close enough to the sensor' Does it mean, distance between corrector and CCD ? Thank you BR JM Choi

Hi. I use ASA N10 and 3" wynne corrector with QSI683wsg camera. And I use astrodon 31mm filters. and adapter made by ASA for qsi683wsg. When I took a picture with above system, there is vignetting on each corner. I wonder that where the vignetting came from. Is it just vignetting or interference of ray path with adapter?? Here I attached raw image file (R channel, 300sec exp. 2bin), please some one analysis it Thank you for advance. m3 -001r.fit