07-28-2020 10:50 PM
I was shooting the Milky Way on a dark and very damp night. I used my Canon 5D Mark111 with the 24 to 105 lens. I wiped off my lens many times through out the night. I could see the dampness on my body of lens and on lens glass. I shot with same camera and lens that night before it got damp and didn't get the line in it. I also shot with same camera and lens the next day and didn't get line in images. So the only thing I can think of was the dampness of the night. But no one else had this problem that night that I shot with. I also covered the eye hole so there was not light leak. A week earlier I also shoot the Big Dipper and the Comet and those photos turned out good. It was not very damp that night. I would like to know what you think caused this line in my images. I want to go soon to try to get better shots of the Milky Way. Why am I getting this line? How do I avoid getting this line!? I appreciate any help you may have. Thank you.
07-28-2020 11:16 PM
Seems like you did a good assessment. It happened on a very damp night. Use a lens warmer of some sort. Some folks just rubber band a hand warmer to the lens. There are also USB powered heater bands.