I have been away from astrophotography for about 2 years and i started again this year. I have an atik 383l+ and i have these strange vertical lines at the lower right corner of my images, this started 3 years ago when i stopped imaging and i didn't give much thought to it since i had other things to deal with. Now that i started imaging again this problem is more prominent and it appears when i power my camera via dc-dc step up circuit to 13.5 volts from a 12v battery and from a mains power supply. Can anyone tell me if it is serious, for the time being i can remove them with dark frames but i am afraid this is going to get worse.