Re: Grain aliasing:bracketing slide exposures

["Alan Rew" <arew@xxxxxxxxxxxxxxxxxx>]

----- Original Message -----
From: byard pidgeon <bluedove@ccountry.net>
To: <scan@leben.com>
Sent: Wednesday, April 03, 2002 5:55 PM
Subject: Re: Grain aliasing:bracketing slide exposures


> A half-stop bracket is the maximum you should use for slides, and only
if
> you're very unsure of your exposure. Half a stop is a big deal for
> transparencies.

Thanks for the warning: I'm fairly new to the world of slides, having
taken negs for nearly 20 years...

Unfortunately my Canon SLR only allows half stop increments for exposure
compensation and auto exposure bracketing (AEB). So I'll just have to
meter very carefully, I guess.

> The usual bracketing for slides is one-third stop on either side of
the
> exposure you  think should be correct.

One happy thought that occurs to me here is that I may be able to use a
variation of the Photoshop trick described on
http://serenescenes.com/Techniques/SplitScanning.html

to combine scans from two different slides which have been taken at
different exposures, and blend the highlights on one with the shadow
details from the other.
Of course they'd need to be in perfect registration, or at least
register-able by linear shifts in Photoshop. A tripod would help
(another change in practice for me!).

> Many pros have always shot slides at about one-fifth to one-third stop
> UNDERexposed; I think this is/was standard practice at National
Geographic.

Interesting, but again I don't think my SLR will allow this. Regretfully
I'll not be buying another SLR now until Canon make an affordable
digital SLR with a Foveon chip (maybe 2 years time?).

Thanks for your advice,

Alan Rew


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