to expand film contrast. The Ilford XP2 seems to be better for landscapes and Kodak's BW 400CN,
seems to be better for Portraits, due to it's lower apparent grain, than Ilford's XP2.
If you can use filters, ( I recommend Kodak's #'s 8, 11 & 25A ), then try Ilford's
Delta 100 & Delta 400 ISO films.
Rate all the B&W films 1 stop over. This will align the Zone V exposure value of the scene,
with the exposure latitude of the film. Then if you don't have a built-in meter, compensate
using the filter exposure values, ( 1 stop, 1.5 stops & 3 stops, respectably ).