----- Original Message ----- From: "Herb Chong" Subject: Re: wrong iso choosen
> define "real film speed". As oposed to artificial film speed...... Perhaps a bad choice of words. To clarify, my own experience with black and white has been that N+2 development will give approximately a 0.05 increase in the Zone 1 density, which is a 1/3 stop increase in film speed. William Robb
