FP4 Reciprocity

[Chris Strobel]

Hi, am I correct in assuming the reciprocity corrections are the same for FP4 and HP5?

Thanks!

[Scott Kathe]

Chris,

I just took a look at the Fact Sheets from Ilford for FP4+ and HP5+ and the exposure compensation curves look the same to me. I've only used FP4+ and the curve has worked fine for me but I'm a novice.

Scott

[Ron Marshall]

Yes, they are the same.

[Chris Strobel]

Yes, they are the same.

Thats what I thought.Just wanted to double check.Thanks guys!

[John Powers]

Pack a lunch. They are long.

John

[Bruce Osgood]

I've had occasion to use the 4+ long exposure compensation factor supplied by Ilford and yes, they are long, and they are exact in my findings.

[Chris Strobel]

While this thread is still sorta alive, in Steve Simmons book, He has a table of reciprocity corrections and development reduction suggestions.So lets say your corrected exposure time is 24 sec.The table list a 12 percent development reduction.I assume this is for a normal SBR.But what if I want to develop N-1, do I want to add this 12 percent on top of the N-1 reduction, so lets say I usually reduce 30 percent for a short exposure N-1, now I'm going to reduce 42 percent?

Thanks!