l2oBiN
29-Dec-2018, 07:31
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/file/download/file_id/1883/product_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-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf
Which values are correct?
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/file/download/file_id/1883/product_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-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf
Which values are correct?