All of mine work except a DP-2. That makes Nine working, one not working. The DP-3 and DP-12 use Silicon Photo Diodes, like the Canon F1 New which came out much later. The original Canon F1 (and the slightly revised version) use CDS cells like the Nikon F Photomic meters and DP-1, DP-2, and DP-11. CDS cells can lose sensitivity over time, usually on the lowest end and highest end of the range. The advantage of the Nikon F and F2: you can replace the meter head with ones that works. With the Canon- body needs to be taken apart for the repair.
The meters on my Canon F1 (original version) and Canon EF (The real one, not that AF stuff) work just fine. The latter was $35, missing a screw that was causing wind backlash. Turns out a screw from a Fed-2 worked just fine.
SO- Nikon F and F2, comparable in terms of meter reliability and the Nikon is easier to fix.
Canon 7: I bought a Canon 50/0.95 with a Canon 7 "lens cap". Was cheap, ~$500. The Canon 7 had been dropped so hard that the prism for the framelines sheered at the base "through the glass". Shards everywhere in the mechanism. I cleaned the glass shards out and glued the prism back together, worked fine. Bottom line of the 35mm frame a little fuzzy. The Canon 7 and Canon P sound louder than the earlier cameras, metal foil shutter. Other than not having a cold shoe- no issues. The Canon V series was the last to use gold for the beamsplitters rather than silver, as per cameraquest. The Canon P dropped the linkage for the auto-parallax corrected external finder.
The Canon EF also has Silicone Photo Diode metering.
P.S. I have four Canon F 1s ( 2 F1ns and 2 New F1s), all are more than 30 years old, and to my knowledge have never been serviced, I have checked all the meters against each other with a Kodak Grey Card, and a digital spot meter, to find they agree on with each other to within two tenths of a stop, which I think is pretty amazing.
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