Well, I'm sure the 20D can equal or better the complete darkness
performance of your S110. The 20D has an autofocus assist light in the
form of the built-in flash. If the flash is up it will fire a few pops
to assist focusing. Supposedly out to 13 feet. But I don't use it and
have never even tried it since the event flash setup is manual. It
consists of 2-4 studio lights to light the room and on-camera flash
mostly as fill. With two studio lights they're most likely operated by
radio receiver. If 4 lights are in use, however, two are probably
dependent on their slave sensors which would be triggered by a focus
assist flash from the camera... not good.
Since the 5D has no built-in flash if you want focus assist you need a
high end Canon flash unit like the 580EX. The 580EX has a focus assist
beam built in which supposedly reaches to 32 feet. It's a separate
light on the front of the flash and doesn't depend on firing the flash
tube itself. But I don't own any high end Canon flash units and would
likely be operating them in manual mode even if I did. Since I don't
have one I don't really know exactly how it works. The flash manual is
a little (lot) skimpy on the operation of focus assist.
Chuck Norcutt
Moose wrote:
> Chuck Norcutt wrote:
>>
>> The 5D does have its limits, however. I did experience a few
>> focusing failures (hunting) when it got really dark but the light
>> level was so low that I had difficulty doing it manually.
>
> So there's a point where both systems, electronic and wetware, can't
> see to focus. It's not like it's their pro FF body, so you would
> think they could include something useful like an AF assist light
> without offending any pro ascetics. My tiny little old S110 works
> fine in complete darkness.
>
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