Thank you for bringing this up. I am planning on taking a large format portfolio class next semester, and as I'm going to be doing mostly studio still life images, I'm trying to choose a 100 speed film.
I've settled on Efke. Neopan 100 is just too expensive for my budget, and Illford Delta 100 and Kodak TMAX 100 aren't much better. The cheaper films are Arista EDU Ultra (ne Foma) 100, which has very poor reciprocity, and Efke 100, my current tentative selection, which has OK reciprocity (at least, I can FIND comprehensive reciprocity info on this film).
I find both the Efke and Arista EDU Ultra (which I've both used in 35mm) to be charming little films. I was almost swayed to use the Arista EDU Ultra, in spite of reciprocity, because it has such a similar feel to Agfa APX 100. But Efke has some pleasing tones, and I think some interesting response to delicate surfaces (e.g. flower petals, human skin).
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