Hi all. I have a Polaroid 110b 4x5 conversion that I've built but the lens is doing something that I can't figure out and I'm wondering if there is something I'm missing. I get that it is designed to set exposure based on EV values but the shutter has regular aperture and shutter speed marking which should be able to be combined like with any other lens, or so I thought. I've found that when I set an exposure combination with just the aperture selection and shutter speed ring, the exposure come out a stop over exposed. However, when I set the exposure based on the EV selections the exposure comes out correct. To clarify what I'm talking about, I am a zone system user so I meter a scene, say a portrait. I determine that I want to place a highlight which reads EV 7 2/3 in zone 6. An exposure for this would be f5.6 @ 1/60 if using 3000 iso Fuji FP-3000b. This should be the correct exposure but on the 100b it comes out 1 stop over exposed. When I compare the exposures to one made at that exposure combination using a different and known lens/camera combo (this serves as a known or control) I find that in order to match it I need to change the exposure combination on the Polaroid by 1 stop i.e. instead of setting it to f5.6 @ 1/60 I set it to f5.6 @ 1/125 and the exposures will match. However, if I set the 110b to expose at the EV level determined by an incident meter reading then the exposure matches the exposure made by the control lens/camera combo determined by spot metering and zone system placement as I described above. Maybe Im just really tired but I cannot for the life of me figure out what's going on. Also, the shutter speeds on the 110b sound accurate. I don't understand where the 1 stop difference is coming from when I set an exposure combination the same way I do on any other lens. Is there something about the 100b Ysarex I need to know? I just re-read that and it didn't seem very clear. Sorry, I am tired. Basically what I'm saying is that in order to match exposures, for some reason I need to meter and expose with the 110b as if I were using a film 1 stop/ iso higher then it actually is. I'm wondering if anyone else is experiencing this or if it is due to some obvious reason that I've just missed. In the end it doesn't really matter to me. I'll set the meter 1 stop higher iso if I have to because then the exposures match perfectly. Anyway, I digress. Any insight?