I am not having much luck with the results from various long exposures, not help ed by the fact that the information on the Kodak and Ilford data sheets appears pretty vague. Not surprisingly, given the nature of reciprocity failure, I am en ding up with far too much contrast in the mid-tones, and muddy shadows. What tec hniques have others used (i) to determine the additional exposure required to co unteract the low illumination of the shadows that causes the film to fail to res pond predictably, and (ii) adjust development accordingly? (The main films I use are TMax100, Delta 100, and Tri-X.) It can obviously be done well - vide David Fokos' or John Sexton's work, but it is not working for me at present.