I am trying to identify reciprocity correction factors for the Ilford FP4+ film and have come across two separate recommendations by Ilford themselves?.
For a 5s measured exposure time, The FP4+ technical data sheet indicated the time corrected for reciprocity to be ~12.5s (https://www.ilfordphoto.com/amfile/f...roduct_id/690/)
The same 5s exposure would result in ~8s time corrected for reciprocity if the technical data sheet on reciprocity is followed.
https://www.ilfordphoto.com/wp/wp-co...mpensation.pdf
Which values are correct?
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