Kodak's PPF-400 film displays favorable reciprocity characteristics. It is
about a full stop after two minutes - two stops after 5 or 6. At least its
fairly predictable. It is my standard astrophotography film.
One of the folks on the Astrophotographers mailing list is completing a test
of 37 different films, measuring reciprocity failure as a key metric. The
other main factor is sensitivity at different wavelengths. Its not an
exacting scientific study, but his method seems valid. If the group is
interested I'll cross-post his findings here.
John P
<snipitty - snip....>
>As someone pointed out, there is
>reciprocity failure that changes both time and color with long exposure.
>This varies greatly between films, and color shift can usually be dealt
with
>in printing negative film. The easiest solution is to use a print film with
>little reciprocity failure. As Shipman points out in his books, many
other
>factors come into play that can offset reciprocity failure. I have shot
many
>pictures at night using Fuji Super G Plus 400 that are virtually
>indistinguishable from daytime shots. I wonder how the new Kodak Gold Max
>works. It does have the latitude, but I don't know about reciprocity
>failure. I have been unsuccessful in finding reciprocity failure data for
>many films.
>
>Doug
##################################################################
# This message was delivered via the Olympus Mailing List
# To receive the Olympus Digest send mail to: listserv@xxxxxxxxxxxxxxx
# with subscribe olympus-digest in the message body.
#
# To unsubscribe from the current list send a message to
# listserv@xxxxxxxxxxxxxxx with unsubscribe olympus in the message body.
#
# For questions email: owner-olympus@xxxxxxxxxxxxxxx
##################################################################
|