I think the official definition of Err99 is something like "unknown
electrical problem". Of the reports I know of I'd say lens
communication problems are the most common cause. But BSOD it's not
since the camera is still alive to report a problem. With BSOD the D
stands for death and means it.
I also experience occasional failure of the autofocus button to work but
it's a momentary thing. I have the autofocus relocated from the shutter
button to the back of the camera. When the focus seems not to want to
work I just press the shutter button half way and autofocus comes alive
again. I haven't tried to diagnose it but I suspect it's just that the
camera has gone to sleep in power saving mode and it's awakened by the
half press of the shutter. If I didn't have focus moved off the shutter
button I'd never have noticed it.
Chuck Norcutt
Moose wrote:
> Ken Norton wrote:
>> Dr Flash wrote:
>>
>>
>>> Never seen one of those... yet. (Err99)
>>>
>
> Nor have I.
>> That seems to be one of those catchall error codes that's used for
>> everything from lens-camera communications failure (dirty contacts)
>> to battery on the fritz to all-out four legs pointing to the sky
>> dead.
>>
>
> I wonder if it's a little different with the 5D? On a very few
> occasions, I've noticed the AF isn't working. A quick swipe of
> contacts on lens and body with something like a shirttail and all is
> well again. But no Err indication on the camera.
>
> Maybe 'cause it's Tamron lenses and they withhold information from
> the camera body. :-)
>
> Moose
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