Highway 61
Revisited
- The camera will meter even with non-AI lenses down to full aperture
It means that metering with the non-AI lenses is possible if you 1/flip the AI coupler up to mount the lens 2/focus wide open to ensure some accurate focusing 3/select the aperture 4/manually close the diaphragm to the selected value with the DOF tester 5/meter while keeping the DOF tester button depressed 6/shoot (through a rather dark VF is you are at apertures above f/5.6).
Exactly as you had to do it on the F2A/AS, FM, FE, F3.
No metering wide open possible with non-AI lenses, but for actually shooting wide open.