I have been told that the films marketed by Kentmere (note I said marketed, not manufactured) are the same as the cheaper Ilford versions similar to FP4 and HP5. They are sold under the names of Pan 100 and Pan 400. Ilford now own Kentmere so I cannot see them selling two very similar budget range films.
What's the difference between the Pan films and the Kentmere films? It's quite obvious they're not the same as FP4+ etc. But since PAN 100 et. al. are not available here, it'd be interesting to know about them.
Harman does indeed not publish any characteristic curves for the films, so somebody would have to test it. Fred Newman does this as a service (for compensation, of course), but anybody with a step wedge and a densitometer should be able to do it, so if somebody has that equipment perhaps they could be persuaded by a few rolls of film or a box of paper to perform such a test?
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