Thank you. Won't do that again. I was relying on advice from Adorama that said the Kenko would work, albeit only in bright light where the F8 would not be a factor.I did find that Canon has a "auto lock" feature that will not allow the camera to op...
I know this is an old thread but I have a similar problem. I have a 70D with a Canon 400/5.6 lens. The first time I used a Kenko 1.4 DGX, it worked fine. The 2nd time, it locked up similar to yours. When I took the Kenko off, and just used the 400, i...
