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| p.6 #12 · Firmware upgrade for 300mm, 400mm, 500mm and 600mm L IS II |
Deborah Kolt wrote:
My advice would be just the opposite: don't do it. Mine is now a mess. They have looked at the files, say it is not working properly, but don't know what is causing the behavior and haven't been able to replicate it, so haven't been able to fix it. It's going back again.
Not a happy camper.
Sorry to hear that, Deborah. At the same time, your experience represents a concern on a system level: do Canon folks really have a good grip on their MkII lens AF control ?
I believe that early 400 II and 500 II were released with a control deficiency.......the AF drive was overly accelerated and too sensitive, yielding a jumpy and "nervous" type of AF behaviour. Both lens models were practically identical in that regard. My first reaction to that was that I might have inadvertently turned the camera AF point expansion off, or that the lenses were bypassing the expansion, leaving just one AF point active. Well, that wasn't the case.
Then I thought that perhaps the MkII lenses have been fine-tuned to the new cameras, i.e., 1DX and 5DMkIII, therefore, my "ancient " 1DsMkII/1DMkIIN were the real culprits there. Well, once I observed the same behaviour on 1DX, that theory was dead too.
What did help somewhat was to decrease the camera AF sensitivity to its minimum value. In addition, both lenses behaved almost normally with 1.4xTC MkIII. Yes, there is much irony in having the lens AF performance improved by mounting a TC on it.
At any rate, after the new firmware installation, my 400 II has become more cilvilized in its AF behaviour. Not a big difference, but it is there. As far as 500 II is concerned, I still haven't had a chance to verify its performance more thoroughly.
Fortunately, my 600 II has come with the up-to-date firmware, and it works real well, perhaps better than any other model, and much better than my friend's "jittery" 600 II which I tested several months ago.
I have tried to get some info from CPS about the exact purpose of the new lens firmware update, but to no avail.