Quote:
Originally Posted by AG Hybrid
Yep. If you can get the tracking good. You'll get image rotation in longer exposures but software should be able to de-rotate images.
In the interest in reducing star trails lots of sub 2 second exposures should do the job. I saw a demonstration/video of ZWO camera and sharpcap for EAA with sub 1 second exposures just constantly stacking. Looks great. Can't wait to use my ZWO 224MC. But I put it under the Christmas tree. For the first time since the year 2000 Ill actually have something exciting to open on Christmas day.
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Tracking dobs or tracking Alt Az's shouldnt get star trails but they will get star rotations, which as you say software will derotate. IE the mount will correctly track the central bit of the image very well, but stars all around the edges will rotate after a time. Most commonly used figure on the web is to only go 20 secs on an AltAz before you get star rotation. But you can actually go longer in some parts of the sky, but unfortunately have to go a lot shorter in other parts of the sky. Here's a bunch of tables for various latitudes showing the MAX you can go in various parts of the sky (Alt and Az) before you will get star rotation effects.
May be useful. Read the albums description lines for how to use them.
https://flic.kr/s/aHskL4YGR5
cheers