I had a quick question about building calibration libraries and whatnot. Would it even be worth it for someone like me? The reason I ask is that I have to set my scope up every time I image. When I tear it down, I pull the imaging train off as the telescope doesn't sit high enough on the losmandy plate for me to leave it on and store it on my desk in my office space. I leave the imaging train intact and removed it as a whole, removing it from the telescope at the field flattener and including everything back to the camera. I know that orientation plays a role in that, when taking calibration frames, it has to be the same orientation as were taken with lights. Since it is coming off of the telescope each imaging session, would it be advised to take calibration frames for every session? I would prefer to build a calibration library but realized last night as I finished my calibration session, that when I disconnected the imaging train, the collar on my Esprit 100 rotated slightly as I removed the imaging train. How much can an ever so slight rotation affect the quality of the calibration frames if I am unsure if it is in the exact orientation that it was in when taking the cal. images? Is it negligible if it it is ever so slightly out of rotation? It's just something that I was curious about since it rotated on me last night. I plan on putting the telescope up on a stand of sorts so I can keep the imaging train up off the desk while leaving it connected for this reason and others. Would my calibration frames from last night only be good for the imaging session the night before? Thank you for taking a look at my question and I appreciate any responses you all may give! Thank you and clear skies!