If you believe you can, or you believe you can't... you're right.
pfitz, which film are you using? I typically use HP5 and for exposures that are 1 second I add 1/3 stop more exposure. 2 sec I'll give 3 sec instead; 4 sec I'll give 6 sec; 8 sec I'll give 12... I have a graph that I made. This also applies to FP4. No exposure compensation is given. Some films require more exposure, some less like TMY.
Super simple answer is reciprocity compensation is about exposure time.
Read up
http://filmphotographyproject.com/co...rocity-failure
Zak Baker
zakbaker.photo
"Sometimes I do get to places just when God's ready to have somebody click the shutter."
Ansel Adams
One man's Mede is another man's Persian.
No, Vinny's right. The OP needs something to read while we amuse ourselves. And reciprocity has been covered at length, here and elsewhere.
Personally, I'm done answering questions and explaining simple things to posters who can't be bothered to bestir themselves and look it up.
One man's Mede is another man's Persian.
The compensations that manufacturers suggest are given with the assumption that you want an image with a normal tonal range. I like to think of RF as an opportunity to get some deep black areas if you don't do the compensation, or maybe just not as much.
John Youngblood
www.jyoungblood.com
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