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Hi there, So today when I was reviewing some pictures that I took with my A7s I noticed a strange faded strip that runs vertically along the lower left hand side of the frame. It's as if the brightness of this small patch has been brought down. It's not small as it's about 150 pixels wide and goes about half way up the frame. This is the second time that I have noticed this issue. I had the same problem with a number of pictures that I took last week. Both times it's been very specific frames on a tripod that haven't moved much, but the issue is identical. The first time it was a warm day of about 25 degrees C, today it was -5. What is especially strange is that it will appear and disappear between pictures taken on a tripod in the same spot. I can see no reason why it's there or why it disappears. The only constant is that both times it's happened it's been after I've been doing long exposures for a bit. I've tried briefly to recreate it but have had no luck. I've been shooting on Canon FD lenses adapted to fit my A7s. The first time I was shooting with my 50mm but today was with my 24mm. I can't see anything wrong with the lenses or the adapter. It also seems a bit too straight for it to be something with the lens. I've attached a couple of crops which show the left side of the frame. These images are the full vertical resolution of the image so you can see how the strips fade away. 1st image - https://drive.google.com/file/d/0B_UH1Uv2rYdMOUlOX2VqTEppV1E/view 2nd image - https://drive.google.com/file/d/0B_UH1Uv2rYdMVmdtZzFoZHJoQzQ/view If anyone has got any ideas it would be great to hear from you. Obviously I'm really hoping that this is an easy fix/ solvable glitch, I'd hate to find that this is anything more sinister. Thanks in advance for your help, I really appreciate it. Jamie