I don't understand the filter factor adjustment on the side of the Rolleiflex F series cameras. Is it filter factor or stops?
My understanding from reading the manual is that turning the filter factor adjustment wheel on the ASA/DIN adjustment knob would adjust filter factor. So, turning it to 1.5 for a medium yellow filter would increase the exposure by 2/3 of stop. However, on my camera (3.5F version 3) it seems to adjust in stops, not filter factors. Turning it to 1.5 means that I am exposing 100 ISO film at about 38 ISO, not 64. Can anyone confirm?
Thank you.
jason
ps: First post here. I haven't had a medium format camera for 20 years, and am very excited about my Rollei...