jln_tc wrote:
I just purchased a Canon 6D camera, body only. I have selected Canon lens already but when I attach the Sigma 18-250mm lens I've noticed that when the lens is at 18mm to 135mm and look through the view finder, it looks as if you are looking at a 1959 TV set until it passes 135mm. At this point the circle goes away. Can anyone help?
jln_tc
I believe that the Sigma 18-250mm is designed for cropped frame cameras (EF-S mount) and your 6D is a full frame camera (EF mount). You can damage your camera and/or lens if you use this lens on the 6D.