I have an 8" Edge HD and use it with 0.7X reducer for astrophotography. I removed the corrector and cleaned it and tried to collimate it again. Here is the result without reducer. I am wondering if it is good enough. I did this test on Dubhe star of the big dipper. The exposure time was 100 ms, so the star shape was changing very fast (expect a little more dofermation on the star shape as taking the right frame is hard at this speed). I took an image of the slightly defocused star at every edge/corner of the ASI1600 sensor and combined all in one image and did some post processing to make it more clear. I checked the moon with it and the view was really amazing (APO Quality), but couldn't take any image as the clouds rolled in(will try another night). Please let me know what you think. Hope you are all doing well these days and not affected by this virus.
Edited by mehdymo, 04 April 2020 - 02:58 PM.