Ah, ha!
Malcom, you hit the nail on the head. I was shooting in P mode, it was pretty dark in my office and both lenses were shooting wide-open.
I just did a test and both lenses will shoot all day wide open. If I ask for them to be stopped-down at all, boom... Err99!
And... I did the same test with the 400, I get Err99 if it is stopped down too. Damn.
It turns out that it wasn't the camera "learning" to error out on the lenses, it was my "bad" luck using them for the first group of shots wide-open which the camera will tolerate.
Thanks for the key piece of the puzzle.
Bill
Malcolm Stewart wrote:
----- Original Message ----- So if your first shots were taken at
full aperture, you wouldn't have noticed any problem. Sigma UK re-chipped
my lens and all was well.
(Unfortunately, they couldn't do anything for my older Sigma 500 f7.2 APO*
which has provided some super shots of birds when using my EOS3. *usable at
full aperture only on my 10D.)
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