Firmware Updates and Micro-adjustments

[Dave Leroy]

I was just reading Robert's comment about the firmware updates for the 5DIII. There is a remote possibility I might use a 300mm/2.8 and a 2X TE but am hesitant to update.
Several years ago I updated the firmware for a 50D. The update screwed up all of the micro adjustments I had done. I have not done any updates since.

I am wondering the micro-adjust issue was a one of instance, or if it is typical of doing firm ware updates?

Thanks.

[arash_hazeghi]

updating 5D3 firmware does not affect stored MA values. you can also back up these values to your PC before updating using EOS viewer utility

[Dave Leroy]

Thanks Arash. It was not that I lost the MA values for the 50D; it is that something changed. The original values were still stored in the camera but were no longer accurate. I had to redo the MA's for whichever lenses I had at the time. I remember cluing in to the issue at the time because of comments on DP Review. It sounds like you have done camera firmware updates with no change in focus accuracy.

[arash_hazeghi]

Thanks Arash. It was not that I lost the MA values for the 50D; it is that something changed. The original values were still stored in the camera but were no longer accurate. I had to redo the MA's for whichever lenses I had at the time. I remember cluing in to the issue at the time because of comments on DP Review. It sounds like you have done camera firmware updates with no change in focus accuracy.

I haven't seen focus accuracy affected by firmware upgrade on any of the camera bodies I have had so far.