Re: [OM] Doing the Splits

[Ken Norton]

> Would you like to rethink that statement?  What ends up on the
> film/sensor and ultimately in the print from a detail standpoint is the
> same set of light rays that passes through the viewfinder.  If there's
> greator DoF in the print there was greater DoF in the viewfinder.

I rethunk it. I stand on that statement 100%. A cropped viewfinder
image doesn't change DoF at all. A 50mm lens casts the same DoF
characteristics in a 1:1 viewfinder no matter the film/sensor format.
It's just that the entire viewfinder image in a Fourthirds camera is
1/4 the surface area of an OM viewfinder image.

Where I think you might be confused in this is that a 25mm focal
length is roughly the equivalent in FourThirds as 50mm focal length is
in an OM. If comparing a 25mm lens on FourThirds to a 50mm lens on an
OM, you are correct. But what I was saying is that the exact same lens
on either format will produce the exact same DoF characteristics for
focusing.

Think of it this way, if you masked out 75% of the viewfinder image in
your 5D, does it change the DoF characteristics of the lens on the
camera? Of course not.

AG
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