William Robb wrote:
First, we'll have to presume that the Agfa film really is 400 speed in practice.
ROFL. Now we got to defining ISO speed for B&W film. An interesting exercise per se, since it's defined for a reference chemical soup, concentration, temperature, agitation and time.
Since you'll rarely if at all use the reference....
Under more general conditions, such as most typical snapshooting and the like, expose within the range of the film and develop at a time that allows the film to capture the entire range of the scene.
Now this is the real advice for Frank. And yes sometimes something will still fall out of range. Oh s**t. So what. I can live with it. What Ansel didn't have at hand with his view camera was easy bracketing. Now even my "dinky little digicam" can automatically bracket for exposure focus or white balance. Yeeehaaa. BTW if all that's in your viewfinder is skin, you'll want manual white balance tuning. Auto doesn't work. Not on Canon. Or maybe they tuned it for some blue skinned ET gals.
Cheers !
