Up to now i've only spent a single night on any one target, but i've recently taken up doing some Bi-Colour imaging, which obviously requires spending more than one session on any given target. My query is, on the 2nd night what is the best way to get as close as possible to the framing from the 1st night? My usual workflow is as follows:
- Save a sequence using the FMW.
- Centre on the object, then rotate manually to the correct angle. I don't have a rotator so i just eyeball this part and repeat until i'm within my margin of error (3°).
Recently on my first attempt at revisiting a target (which all went fine) i noticed afterwards that there was more rotational difference between the 2 night's images than i was happy with. On the 2nd night, i just loaded up the original saved sequence, without realising that on this night i could have been out by +3° whereas on the 1st night it could have been -3° (so potentially the maximum difference could be as high 6° !) and i now know that this degree of error is too much for me.
Now, i know i can obviously just reduce the margin of error down to say 1° but in this case that could still potentially mean a total difference from Night 1's images of 4°, so, long story short, is there a more straightforward way for me on the 2nd night to tell SGP to centre and rotate on one of my frames from the 1st night?
I know how to Centre on a previously saved image, but i don' t know if SGP will tell me how much to rotate to in order to match it.
I get the feeling i'm missing something really simple here!