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Comparison between F/2.8, F/3.5, f/4
Since I removed internal iris, the aperture is external (black plastic folder).
Exposure times were 5sec, 7sec 10sec, single frames, straight out of camera.
Stacks look much better - see Catalina (crop from full resolution stack 16x10sec, ISO1600 @f/4)
The difference between full aperture (143mm) and f/3.5 is drastic.. but 3.5 and 4 are almost the same (in terms of diameter, this is 114 and 100mm).
So, it seems 110mm will be just right.
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