Hi all, I recently purchased my first DSLR and I have been kicking around in some star photography, 30 second exposures with various ISO's and such. However I have found the the higher I place my ISO the more of a red haze I get around the borders of my photos. I thought this was an issue with the camera I bought, as I bought it refurbished. So I returned the camera, and got shipped a replacement. I AM HAVING THE SAME ISSUE on the new camera. I will post photos when I get home to my SD card, and any explanation to this problem would be greatly appreciated, as I cannot find what the cause may be anywhere else. Thank you!