"Pre-Intergration Crop" if that is possible

@andynowlen Andy,

There are three possible final frame sizes possible: full, reference and crop. When you choose reference, the size of the reference frame will be used for the final crop but it will also match the field of view of the reference frame. If you apply dithering then it is likely that the area of the reference frame will be different than the final area that all images of the smaller camera contribute to. This means that areas of the sky will be included where not all images contribute to.

Why would you want the integration result to be cropped for you?

I notice that in the final "all session" stack the smaller field of view is always noticeable. Whether it is darker or lighter.  

Usually, I have to then crop to the smallest field of view - which I knew I would have to do at any rate.  

As a test, I tried a project with three different fields of view.  APP dimensions the stack according to the widest field of view.  Then if I crop to the narrowest field of view the cropped image is very small.  

I.E. final three scope stack dimensions = 5100x3600 for instance.  Dimensions are fictitious for illustration only
Cropped to the smallest field of view = 2300 x 1700 for instance.  Dimensions are fictitious for illustration only

Normally my smallest field of view is 3,000 x 3,000. (Asi533MCpro). So, it seems some resolution and detail might be lost if I am always cropping to the smallest field of view in the end. But I am a total amateur.

This led me to ask the original question.

As always,  Thanks much!

Andy

@andynowlen Thanks for the explanation. Have you tried integrating the data of the two telescopes in two separate sessions or completely separately, removing light pollution from them and then integrating them? To do the latter, load them as lights (don't load calibration data), go to tab 6 and click integrate. That may take care of the difference in background brightness between the two of them.