Thanks Timgreat information. I'm shoting with a 5D lll. The wide angle is the issue, I'm actually shoting northern lights while trying to make the stars in super focus. A chalange for sure. I have gotten great shots in the past but they were out last...
Thanks for the tips. Yes I know the earth is moving. With this wide angle lens the focus point are so small. I'm going to use a 90 degree viewfinder attachment that magnifies. Also I can zoom in on live view during the shoot.
