FoCal and Canon 6D support – update
We’ve been getting reports that some (not all) Canon EOS 6D cameras can give erratic results using FoCal. The symptoms manifest as FoCal reporting that it needs to take more shots because of inconsistent results and the resultant graph has shots that are as sharp across all AFMA values. We’ve tracked this down to an issue with changing the AFMA value automatically. For some reason the camera doesn’t always respond to changes of AFMA made via the SDK. We’ve seen this once after some heavy testing after the the first reports came in. It doesn’t seem linked ot any particular feature (we’ve combinations of custom functions such as disabling shutting release before connecting to FoCal) and it doesn’t seem reproducible. In fact the one time we saw this behavior it was after changing lenses with the power left on and connected to FoCal.
What we have found in all cases so far that setting the AFMA to ‘per lens’ and making a change by hand to the AFMA value seems to make the camera behave as expected. So if you see this problem please go into the AFMA settings and set it to per lens and then change the value on the lens you’re testing to say -1. Don’t worry FoCal will make all the actual changes automatically. We’re trying to isolate the problem but as you can appreciate the fact that it appears to be un-reproducible at this point makes it hard to determine if its genuinely a problem in the Canon SDK or elsewhere.
Many thanks for your understanding and we’ll update you as we learn more. In the meantime please continue to use the above workaround until this issue is resolved.
Thanks and all the best from the FoCal Team.