Re: Compensating Reciprocity Failure

From: Benno Jones <bennoj_at_domain.name.suppressed>
Date: Thu 24 Aug 2000 - 02:33:06 PDT

In Steve Simmons' "Using the View Camera" he gives the following reciprocity info for Ilford films (with the caveat that while these figures work for him, you may wish to experiment to get the best results for yourself).:

(All times in seconds)

                                Metered Time
                                2    4    8        12        16        24          32          45        60       90        120

Exposure Time        3    7    19        33        50        93        145        250      378     853        1670
Development Adj.    -    -    -5%    -8%    -10%    -12%    -14%    -16%    -18%    -20%    -24%

That's about 27 min 50 sec actual exposure for a 2 minute metered exposure, quite a bit of underexposure if you only went for 5 minutes.
I haven't tried these myself, but am now working on a pinhole for my 5x7 camera and will be trying it out with both HP5+ and FP4+ in the near future.

Benno Jones

"Erich C. Decker" wrote:

Hi,

Does anyone use ILFORD HP5 Plus sheet film for pinhole photography?
If yes, I need advice.

The manufacturer has supplied my with a reciprocity failure chart
that end with 35 seconds metered time, transforming into 200 seconds
actual exposure time. On my last shooting meter reading was 2 minutes.
A wild guess was to compensate for 5 minutes, but both negatives
came out quite underexposed.

The reason I use HP5 is that in Europe it is:
A) cheaper than Kodak
B) An excellent film for (almost) any photographic purposes
C) Can be generously pushed and pulled
D) I juts like it

Do any of you HP5 users (assuming there are a few worldwide)
have any personal experiences to share?
I need corrected exposures times, let's say from 1 to 5 minutes.

Erich

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  Received on Thu Aug 24 05:32:32 2000