Good and correct thought ?
Indeed, data of one and the same session should be registered with the “same camera and optics” setting. If you combine data of different sessions. The “same camera and optics” is also to be advised if you know that the optics and camera haven’t changed fundamentally. So for optics that have undergone a change in collimation or for instance an adjustment in the reducer/ flattener/ corrector distance should be registered without this setting for the most optimal results.
With the “same camera and optics” setting on, the distortion model is only calculated once and will be identical for all the frames that you register. It you turn “same camera and optics” off, APP wil calculate distortion correction models seperately for each frame ? So it should only be used when it’s needed. The registration RMS in the registration column will indicate if turning the setting off is beneficial for your data. So by all means, experiment and check the registration RMS values per frame. If you notice significant differences in the RMS values with the setting on and off, you’ll know if it’s needed ? Lower RMS value is better.
The MBB setting has nothing to do with registration. It will however remove the seams in your data if you combine data with different Field Of Views. So yes, for combining data of different sessions, I would always advise to turn MBB on. As a matter of fact, in almost all cases turning MBB on is to be advised ? It will reduce stack artefacts at the borders of your stack.