IMAGO 320 is a fine grain film with a very high sharpness and a wide exposure latitude. It is a panchromatic film, coated on acetate base and compatible with most available developers. A Black and White Film nominally rated at ISO 320 speed, it can be used both indoor and outdoor with different light conditions.
320 ISO is the nominal sensitivity of the film, which returns a correct and wide tonal range. This conveys higher detail in shadows and a very fine grain. With some developments, it can be pushed up to 800 ISO.
The 320 ISO selector is between 200 and 400. Otherwise you can set it at 200 ISO and over-expose by half stop.