> >> 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? >
> >> --
> >> Paul Prior .
> >
> >Paul, if you are indeed seeing the whole depth of field in
> focus, you must
> >have set your custom function to show DOF. Check your functions.
> >You should certainly be viewing wide open as a default.
>
> Ah, but that is my point - wide open should show the LEAST depth of
> field, yet the viewfinder to me looks like it is at f16 all the time
> in terms of DOF.
Could it be.. (and im taking a stab in the dark here..) that when you look
through the viewfinder past the object you have in focus (in the viewfinder)
your eye focuses on some part in the background, rather than focusing on the
object in focus, effectively bringing the background object "more" into
focus.
Trying to explain it another way, it's as if you have two lenses. The front
one has a fixed focus on one object. The second lens (your eye) has a
variable focus. When focused on the same object as the first lens, the
object looks in focus. When focused on part of the background, the second
lens corrects for some of the apeture blur.
It could also have something to do with the very small image size. I can
see out of focus objects more easily on the groundglass of my Linhof 4x5.
Anybody feel free to correct me..
- Stuart
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