With the 203 FE, is it possible to utilize the meter of the camera, when not using a lens with databus. I mean, just for calculating the appropriate exposure, like a normal light meter or prism finder?
Yes it's possible. I even use a 202FA witch is worse.
It's not like a PME prisme. You cann use in automatic with diaph closed. Or you close diaph, put D mode then the speed is selected. SO you cann open the diaph and shot. If the light change you have to do it again.
The C lenses arrive 50 years ago. The CF lenses arrive in the 1987 years (It's about the years I first saw but I have to veryfy). So thirty years for the used lenses for sale is an average.
I use my C-80mm in B mode with my 202FA with succes at any speed. If you use the speed of a C-lens with the B mode on 202FA you need to use ... the 10 seconds delay that exist on C-lens and wait more than 10 secondes. It's not an option I agree !