Canon Photography

MKIII - refuses to focus!!



Hi There all MkIII users is always use the 300 2.8 L with either a 1.4 or the 2x tele on. The problem is that occassonaly it refuses to focus at all and the green light just flashes in the view finder. You have to physically manually focus it near the focus distance and its pops in!, FRUSTRATING!!!!

Does anyone else have this issue.

PS. I always use AF always.

Thanks in advance


Have you loaded FW 1.1.3 that stops a lot of that - also the limit switch being set right makes a diffrence.
Rob.


Hi yes i did, and since then have had other focus related issues, such as the focus floats in and out on static subject using AI. even tried Rob Galbraiths -1 focus adjustment.
in a burst on a static object first one will be spot on then a couple of soft ones then perhaps 2 sharp one ect. I appreciate that AI isn't really for static subjects but it should still perform a lot better than this!

read yesterday on DP review that one guys was having so much trouble he was going to revert back to 1.1.2, it may well be that 1.1.3 doesn't work too hot with the faulty sub mirror, so will wait until they fix that as well

Also which limit switch were you refering to?

Thanks for the suggestion.

Mike


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