[quote="mvjim"] One thing that I believe would help, many in threads such as this, is to mention what format you are generally using. What might be the hot thing for 8 X 10 negs might not be the thing you would suggest for 35 mm.

As I see it, one should look for .10 density after subtracting the film base + fog density regardless of format size when testing for zone I. This will be very little in largeformat and maybe as much as .35 density in 35 mm. That is why it is stated as ".10 over fb+f. To help clarify, Fb+f is the clear portion of the negative.