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Re: [OM] film for lens testing

Subject: Re: [OM] film for lens testing
From: Ken Norton <ken@xxxxxxxxxxx>
Date: Mon, 6 Jul 2009 07:23:03 -0500
>
> I believe AG has recommended against Velvia for this use because of
> lateral halation that reduces effective resolution. Or some such film &
> Fuji thing.
>


For high-contrast targets, this is correct. However, Astia 100F is
acceptable as well as the new Velvia 100 if your target ratio is no more
than 5:1 or so.  If it's like 8:1, I'd avoid all Fujichromes, personally.

If you use a transluminant target which can achieve greater than 20:1 the
lateral halation becomes quite obvious. Ilford HP5 holds a place of honor in
my experience as the most lateral-halation prone film I've ever used. I've
had highlights from one image leak into the adjacent image!

AG
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