Pulled film and reciprocity failure calculations
I ask this question gingerly, mostly through fear of being shown to be horribly wrong, but here goes.
Many of the developers I use give better results with films pulled to a lower EI - so Erik's excellent Tmax400 at 200 in Perceptol 1:2 or many of the PMK Pyro developed films that Chris Crawford gets superlative results from at lower EIs.
When using pinhole or large format I regularly get into reciprocity failure territory (actually I want long exposures with the pinhole - it reduces the risk of my thumb appearing in the exposure operating the shutter). Manufacturers publish reciprocity failure calculations to adjust for this - but to the best of my knowledge and belief all are at box speed.
How would you calculate exposure time where the film has been pulled?
Leica M2, Nikon D700, Bronica RF645, Leica CL, Summicron 40mm, Rolleicord Va, Hasselblad 500 CM Zeiss Planar, Leica 50mm Summicron V3, Hasselblad PME51 metered prism, Zeiss Ikon Super Ikonta 534/16 & Ensign 820 Special - all gone.