Re: Determining exposure beyond.....................

I've had no experience with ilford HP%, and each BW film has it's own
requirement. my general advice is expose longer than you think necessary
and it'll probably be OK. The reciprocity failure you're trying to
compensate for in fact buffers the overexposure error.
----- Original Message -----
From: "Rune Tallaksen" <tallaks@alfanett.no>
To: "Pinhole-Discussion" <pinhole-discussion@pinhole.com>
Sent: Monday, September 17, 2001 11:01 AM
Subject: [pinhole-discussion] Determining exposure
beyond.....................

> Hi list!
>
> Can anybody help me with how to determine exposure when correcting for
> resiprosity failure when the measured esposuretime exceeds that of the
table
> from the filmvendor?
>
> For instance when using Ilford HP5 Plus, the film data sheet gives the
added
> time for resiprosity failure until initial measured 35 secs(corrected for
> pinhole f stop). How can I calculate the "correct" exposure time beyond
this
> point? Tiral and error until now has not been satisfactory for me.
>
> Any help will be appreciated.
>
> Rune
> Norway
>
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> # Rune Tallaksen #
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> ( ) )/
> \( (_/
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Received on Mon Sep 17 15:25:06 2001