Posted by The attempt was to fine tune the pixel size for the ZWO ASI120MC. The pre-calculated values are shown in this table, with the goal size in yellow. This would give 0.33″ per pixel. The resolution of the 5 inch SCT is somewhere around 1″ (1.1″Rayleigh Limit and 0.93″ Dawe’s Limit) so this would be a good 3 pixel diameters per resolution disk. Even accounting for the Bayer pattern, it’s not too bad.
Here is the imaging chain. If your a pro you can see the problem right away.
Notice this is an 1250 mm FL scope, a 0.63 focal reducer and a 3x Barlow. The piece between the Barlow and the camera is an atmospheric dispersion correcter (ADC) doesn’t really have a magnification or focal length associated with it. However, this adds another 2 inches (or 50.8 mm) from the Barlow face to the image chip. If the original Barlow focal was 30.16 mm (a guess) and the original distance was 60.32 mm the magnification would be 60.32/30.16+1 = 3. Add another 50.8 mm and you get (60.32+50.8)/30.16+1 = 4.8. Put that in the table above and you get 3780 for focal length back to where you started. So what did we see?
Here is a video of Jupiter used for imaging.
The nice thing about using Firecapture is that if you let it automatically detect and center the object it will estimate the resolution and focal length used. Here is the log file:
Firecapture thinks the focal length is 4300 mm. That means the Barlow is providing 5.5x magnification. Live and learn. Here are some images that came out of it all:
Ganymede (1.6″) & Callisto (1.5″) 
Neptune (5.79″) 
Mars (9.69″) 
Jupiter (45.39″) 
Saturn (17.94″)