> From: "Sawyer, Edward" <Ed.Sawyer@xxxxxxx>
>
> As has been mentioned and proven innumerable times, the effective (as in,
> visually in terms of DOF, blur, et al) f stop in this case is f/4. It
> doubles as does everything else.
I think what has been "proven" is that the effect is exactly the same as if you
cropped the centre out of a bigger image.
The focal ratio has not changed.
What has changed is the apparent depth of field if it is blown up to the same
size as a full-frame image. In that case, yes, it will show the same DOF as if
the full-frame image were stopped down to f4.
Certainly, the light-gathering ability has not changed. You could shoot either
4/3rds or full frame at the same shutter speed and aperture.
----------------
:::: Nothing in education is so astonishing as the amount of ignorance it
accumulates in the form of inert facts. -- Henry Adams
:::: Jan Steinman, EcoReality Co-op ::::
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