Ah, not quite. If I look at my father and grandfather's pictures, most were taken at ISO 10 on KodachromeI. Shutter speed of 1/50 at f/3.5. 50% of them are unsharp due to movement ( camera or subject ) and 50% are unsharp due to lack of depth of field or poor focus ( check out the ground glass of a 1938 Rolleiflex, I'm surprised that they got anything in focus at all ). So, modern ISO of 800 with the equivalent grain of Plus X film is a real bonus.