I’ve got a problem that I don’t understand. I'd love to get a fix, but at least some advice.
Canon 7D2 with v1.1.0 firmware (latest). It’s always worked great. Sigma 150-600mm Sport with 1.05 firmware (latest). New from one of the big NY guys.
For the 1st time, I put the Sigma on my 7D2 yesterday and went out to test it. Very disappointing. My camera kept locking up. When the camera locked up, it could not be turned off. A spinning animation was displayed, with the message “Recording… Remaining images:1.” The only way out was to remove the battery for a few seconds. I gave up to go home and run some controlled tests.
Testing results… The camera/lens combination works great at 300mm and below. Works every time. The combination fails every time at 400mm and above. Very solid failure. I didn't test between 300-400 because I didn't think it would add anything to my understanding. When failing, no image gets written to the card. I waited almost an hour. I put on a Canon 100-400mm at 400mm at it works perfect. So, even though it makes no sense to me, my logic says the problem is the Sigma lens.
I think I can return the lens, but it was a closeout kit so I’m not positive. And… if I did, should I get a replacement lens or give up on Sigma.
I can try to contact Sigma and/or Canon, but haven’t spotted a good place to ask a question.
There is a Sigma authorized repair center about 60 miles from me. I guess I could drive over and hope someone would let me demonstrate the problem, and get their thoughts.
Advice (or better yet, a fix) ???