When I replaced the PH-140 75 watt bulb on my Beseler 23c II I found that the printing times were decreased by exactly one stop. If I reprint picture made with the old bulb, I'll just have to compensate base exposure and burning/dodging times by one stop which isn't too much of a convenience. Paper speed between different batches of ilford are very consistent. However, once when I opened a new pack of Foma Fomatone 132, I found it to 1/3 stop slower that the old pack I was using. |