I'm a complete beginner in astrophotography but I've been doing some research into it because it seems like a really cool hobby! There's something I haven't seen explained anywhere yet about the image collection process, in the scenario where a fixed mount (not tracking) is in use and many exposures are taken to be stacked (and other processing steps, of course). If I were to center my target in the camera field of view and begin taking exposures, how do I know WHEN to stop to adjust the camera, to re-center the image, before taking more exposures? I am assuming that the stacking software is lining up the individual images in order to combine them, but is it able to work with images where a small target is located in a wide range of places in the camera frame, or must I re-center the target area more frequently in the camera frame so that there is not much difference between individual images? Thanks for any input!