Re: Reciprocity question and unrelated Agfa XPS 160 question

Murry,

I don't worry about failure of the Reciprocity Law. I just go out and shoot.

Here are some of my favorite Agfa XPS 160 pinhole shots.

http://photoco-op.org/modules.php?set_albumName=album06&op=modload&name=Gallery&file=index&include=view_album.php

Mike Atwell

----- Original Message -----
From: Murray Leshner <murrayatuptowngallery@yahoo.com>
Date: Fri, 27 Aug 2004 20:30:09 -0700 (PDT)
To: pinhole-discussion@spitbite.org
Subject: [pinhole-discussion] Reciprocity question and unrelated Agfa XPS 160 question

> Hello:
>
> I was looking at an Agfa Portrait XPS 160 data sheet
> today and the reciprocity info struck me as based on
> base 10 logarithm (neat clean curve fit).
>
> So I plotted out how many seconds for increments of
> 1/4 and 1/3 f-stop increases. Round off to nearest
> second :O)
>
> f t, seconds
> 0.25 1.77827941
> 0.333 2.15443469
> 0.5 3.16227766
> 0.667 4.641588834
> 0.75 5.623413252
> 1 10
> 1.25 17.7827941
> 1.333 21.5443469
> 1.5 31.6227766
> 1.667 46.41588834
> 1.75 56.23413252
> 2 100
> 2.33 215.443469
> 2.5 316.227766
> 2.667 464.1588834
> 3 1000
> -------------------
> Separate question: Since I bought some of this film, I
> wanted to know if anyone likes it.
>
> I have read it's sharp but has muted almost 'pastelly'
> colors and 'low contrast', does better with colors
> other than blue/green, not particularly useful for
> landscape.
>
> I wonder if the small grain and good resolution is
> lost on pinhole, or if it has some interesting
> alternative use other than portrait, like
> architectural or (unsaturated) fall colors...farm
> fields, etc.
>
> Someone posted it was good for b/w (???) I don't grasp
> that; low contrast color film for b/w?
>
> I wonder if one could get some of those images that
> have so little color it' shard to tell whether it is
> color or b/w.
>
> It's ISO 160 and people say try it at 100...I guess
> that's in line with the principle of slightly
> overexposing color print film being better than
> under-.
> ----------------
> I know this has probably been asked before...how does
> one correct reciprocity by increasing time (can't
> increase f-stop)? Is only one corrrection done
> (correcting the 'new' corrected time sounds wrong).
>
> Thanks
>
> Murray
>
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