> From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
>
> ... exposure adjustments for magnification when shooting macro... The
> effective aperture is reduced and the image becomes dimmer.
Ah, but does the resulting "effective aperture" effect depth-of-field, or is
DOF still strictly the result of reproduction factor and true focal ratio (as
opposed to light transmission)?
I suspect the answer is "no, DOF is independent of extension light fall-off"
just as slapping a neutral density filter on the end doesn't increase DOF.
I've often wondered briefly about that, but I've been too lazy to fully
research it and puzzle it through.
----------------
An American is a person who demonstrates against a new power plant, then goes
home and flips on all the lights, turns up the air conditioner, puts a tape in
the stereo, opens the refrigerator door, plugs in the coffee maker and sits
down to see if the television cameras caught him protesting. -- Wendell Trogdon
:::: Jan Steinman, EcoReality Co-op ::::
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|