I've had no experience with ilford HP%, and each BW film has it's own requirement. my general advice is expose longer than you think necessary and it'll probably be OK. The reciprocity failure you're trying to compensate for in fact buffers the overexposure error. ----- Original Message ----- From: "Rune Tallaksen" <[email protected]> To: "Pinhole-Discussion" <pinhole-discussion@p at ???????> Sent: Monday, September 17, 2001 11:01 AM Subject: [pinhole-discussion] Determining exposure beyond.....................
> Hi list! > > Can anybody help me with how to determine exposure when correcting for > resiprosity failure when the measured esposuretime exceeds that of the table > from the filmvendor? > > For instance when using Ilford HP5 Plus, the film data sheet gives the added > time for resiprosity failure until initial measured 35 secs(corrected for > pinhole f stop). How can I calculate the "correct" exposure time beyond this > point? Tiral and error until now has not been satisfactory for me. > > Any help will be appreciated. > > Rune > Norway > > __\/__ > ./ ^ _ \. > |\|(o)(o)|/| > #------------------.OOOo--oo--oOOO.--------------------# > # Rune Tallaksen # > # # > # # > #---------------------------Oooo.----------------------# > .oooO ( ) > ( ) )/ > \( (_/ > \_) > > ------------------------------------------------------------------------ > > > _______________________________________________ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/ >
