My dilemma is I already have a 35 f1.4 with AF. I've thought of the CV75 f1.8 but I have a Canon 85 f1.8 and Sony 90 f2.8. The CV15 f4 sounds intriguing but I have the FE 16-35 f4 that covers that FL almost. Is there a 24 or 21mm lens in M mount that's compact?
Anybody know of DeepSkyStacker.
Well it's giving me a problem.
It won't stack sony .raw files

So this image from late last night (as if I didn't get enough of being out in the cold all weekend on the cycle-camping trip)
is a single raw, 30 second exposure with minimal processing considering I could not stack all 35 images I got of M31. I can only wonder how
much better it might be if I could stack them. I'm sure the problem is with DeepSkyStacker and I even shot in crop mode
so not to choke the software with huge files-that didn't help either.
Sony A7Rii + Astrotech AT65, no tracking, no guiding....just the normal 4 star calibration and polar alignment.
Still I have to say I'm impressed with the Sony sensor-

What an amazing capture! When it is a single exposure of 30s, how comes that it is not blurred out? And what FL did you use?









