Ok, so I just happened to be playing with my new to me F3 this afternoon and I noticed something I don't recall seeing before. When I press the DOF button the meter reading drops by 1 stop. When I let go of the button it returns. It occurs for all f-stops except wide open. The indicated meter reading for each f-stop prior to DOF button push is spot on with my two other cameras. I have used several lenses and the same thing occurs on each. These same lenses used on my FA and F100 don't exhibit the same issue. Not sure if this will effect my exposures or not. Otherwise camera is in good shape. shutter speeds appear correct and meter readings are good. Camera has new light seals.