Re: Ash-throated Flycatcher

At 23/04/2006, you wrote:

Doug,

I'm going expose my digital ignorance here, but when
you say "ISO 400, 2-stop push" with digital I get a
little confused.

Did you take the photo with what you considered proper
metering at ISO 400, then push it a couple of stops in
your post exposure workflow? Or did you set the DMR's
ISO at 400, then dial in +2 on the DMR then expose
normally with no post processing push?



Hi  Bob!

I believe Doug means that he's set the camera at ISO 400 and then (using the exposure compensation feature) deliberately underexposed 2 stops... thus yielding the same exposure as if the ISO had been set to 1600 to start with. Then, plus two stops of compensation is applied during "development" (the conversion of the RAW data to .tif or .jpg format), which would be the same as "push developing" an underexposed film negative.

The difference is that by underexposing and then overdeveloping a silver neg, you generally increase the grain... but you can salvage underexposed film.

With some digital systems (the Leica's DM-R is one) it tends to yield a bit more noise (the digital equivalent of grain) than with the DMR's native ISO 400 setting, but much lower noise than obtained by using the DMR's native ISO 1600 setting. So instead of salvaging underexposed film, it's a way of increasing the quality of shots at higher ISO's.

Got it?



---

David Young,
Logan Lake, CANADA

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