Re: Ash-throated Flycatcher

Got it!
Thanks, David,
Bob

--- David Young <telyt@xxxxxxxxx> wrote:

> 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
> 
> Personal Web-site at:
>       http://www3.telus.net/~telyt
> 
> Limited Edition Prints at:
>       http://www3.telus.net/~telyt/prints.htm
> 
> Leica Reflex Forum web-page:
>       http://www3.telus.net/~telyt/lrflex.htm
> 
> 
> 
> 
> 
>
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Bob Adler
Palo Alto, CA
http://www.raflexions.com

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