I can't believe this discussion has gotten so esoterical--learn how to use
the DOF preview button (that's not the same thing as the CF) and what it is
telling you, and just push the damned thing....I've never ever on ANY camera
had the viewfinder show me what's in and out of focus without using DOF
Preview. Unless the whole
image is out of focus. Part of the viewfinder image in focus, and the rest
out of focus (like when the autofocus fails) is something totally foreign to
me. What am I missing????
Greg
----- Original Message -----
From: "Paul Prior MD" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, November 16, 2000 8:04 AM
Subject: EOS Why doesn't my 1.4 50mm or my 2.8 70-200L....
>
> 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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