Re: Grain aliasing:bracketing slide exposures

["Alan Rew" <arew@xxxxxxxxxxxxxxxxxx>]

----- Original Message -----
From: gary <gsellani@accesscom.com>
To: <scan@leben.com>
Sent: Friday, April 05, 2002 3:17 AM
Subject: RE: Grain aliasing:bracketing slide exposures


> With slide film, more often than not a highlight gets blown out, so
you need
> to bracket in one direction only, i.e. half a stop under. Half a stop
will
> do the job. I think the film is only good to 1/3 a stop, though that
may be
> +/- 1/6th around the nominal rating.
>
> If you are not going to project the slides, you can alter the ISO
setting on
> your camera to force it to underexpose about a third of a stop. A
third of a
> stop is 26%, so if the film is ISO 100, set the meter to 125.

Thanks for this suggestion. It's so long since I last read a book on
photography that I'd forgotten this simple trick. With modern cameras
the problem is that you can become lazy with all the automated features
available.

I think my Canon SLR will allow a manual override on the ISO setting, so
this gives me a way to achieve 1/3 stop under exposure for the whole
roll without having to think about it. If this gives good results with
my particular camera's metering it could save me having to take 3
versions of each shot.

> Some films, such as Velvia, are really slower than they are rated, so
you
> can shoot Velvia at 50. [Those who are going to project the slides
pretend
> the film is 40.]

For the moment I like the idea of using Provia 100 as this is faster,
but Velvia will have to be tried at some point, even though it would
mean using a tripod to get the most from it.

Regards,

Alan Rew


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