My Asahi Optical Co. Pentax Spotmatic II (SP II) was one of the first 35mm SLRs (the 1960s) to offer through-the-lens light metering. However, the Pentax SP II has stop-down, match-needle exposure metering which requires that I flip a switch on the left side of the lens mount, which stops down the viewing lens to the aperture I select and turns on the metering circuitry. Assuming I use a Super-Multi-Coated (SMC) Takumar lenses, the switch resets when the shutter button…
