I had a question pop into my mind today, probably simple, but I
couldn't explain it.
Wide aperture lenses have shallow DOF, this I know. My 2.8L and
1.4/50 both produce a striking blur and I probably shoot the vast
majority of my pics at 3.5 and below.
Why, then when you are looking through the camera to focus these
lenses do you see the whole field in focus? Isn't the lens operating
at wide open aperture when focusing in EOS cameras? I thought so, to
aid in the auto focus speed (which is why 1.4/2.8 type lenses focus
faster than 3.5-4.5 zoom, right [heavier glass aside]?)
That is to say, how come only the film exposed has the DOF effect.
I thought about this as I"m contemplating a new body purchase - wife
wants EOS elan 7 due to smaller size and built in flash, I want the
EOS3 for pure speed and because I hate that built in flash :)
I'm sure I've overlooked something obvious here, please be gentle. :)
--
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