5 Simple Steps to use when Photographing Stars and Star Trails
Since you cannot set your shutter speed at precisely 20.59, go ahead and round that to the closest setting. Now you have a base number at which to begin. You will fine-tune this number when you’re on-site but take note that this is only your starting point, and you will end up making a few adjustments. After a few tweaks, I ended up setting my shutter speed at 23. If you’re forgetful like me or nervous when you arrive at your site, take note and write these #s down now. Tuck them into your camera bag, so you are ready when you get there!