I did a very careful film speed testing of Atomic-X in Ilford-DDX 1+7 at 70*F using BTZS tubes and got a personal film
speed of asa 40 at a scene brightness range of 7. While I agree that this film gives a very nice tonal range with really nice
separation in the shadows and highlights it isn't anywhere near a iso 100 speed film. I like it but the I would like it more if
it were a full f.stop faster as advertised. I was actually looking for a replacement for my dwindling stock of TMAX 100
readyload and it may well become that even being 1/2 as fast .... It is practically grainless and does seem to exhibit a lot
of traits attributable to Panatomic-X including its speed ....<div></div>