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This is not really a new or unknown problem, but I had not heard of it, so I figured I would share my experience.
Yesterday I went on a hike in a local state park with the plan of photographing a waterfall. I hiked out and spent about two and a half hours photographing the falls, coming away with some great shots of the falls and local fauna. I had some nice creamy water shots of the falls taken during a long exposure session.
However, when I got home I found all my long exposures were awful with purple and white streaks in a pattern through the image. The pattern was consistent through all the images whether or not the camera was vertical or horizontal so I knew I had a light leak somewhere. The initial culprit was the 72-77mm step up ring I used on the 10 Stop ND. However, I posted one of the images to a local forum and asked for help and suggestions. One of the respondents posited that it might be a light leak from the viewfinder. After some back and forth and an article on that very thing affecting D600s I had it on the list of things to try when I took test shots. Other things to rule out were a light leak in the step up ring and angle of light causing an internal reflection.
As soon as the clouds broke I pulled out my tripod (an Awesome Vanguard Abeo Pro 283CT with the new GH-300T ballhead) and took several 30″ exposures into the sun and away from the sun. I took one with the viewfinder exposed an one with my hand covering it, and sure enough its a light leak from the viewfinder causing the issue. Its actually a pretty serious light leak, and now that I am aware of it I’ll be using the viewfinder cap or some other method on all my long exposures. I really don’t know why this hasn’t happened before now, but I am educated so I wanted to pass it on to anyone who might find it useful.