Synthetic hydrocarbon greases are suitable for -40°C to 125°C. Silicone-based damping greases damp at room temperature and are still functional at -60°C and +200°C.
But what happens to the viscosity as the temperature rises? I'd expect, as a camera heats up, the grease and oil that's supposed to be one location more freely flows to a new, more troublesome location.
I went for a walk in Palm Springs. CA with my F3HP on a 105°F day.
I found an abandoned 1950's motel that was begging to be photographed..but the F3HP was completely unresponsive.
After I returned to my air-conditioned hotel room, it was back to normal.
My F4S stopped operating after 2 frames in -10°F weather in Indianapolis, IN when the Olympic Flame made a lap around the Indianapolis Motor Speedway, c. 2002.
Back home, it was back to normal.
I live in a hot place and I don't like storing cameras etc outside climate control because of potential oil migration and so on, but I'm more worried about getting a sticky aperture, not about the shutter failing, and have not seen it happen.
I really cannot imagine that a car got hot enough to melt a fuse in the Nikon F5, or reflow circuit board solder. Even the thermal overload fuse in my coffee maker is rated at 165 C (and that's a thermal fuse, not an electrical current fuse). I can imagine that thermal stress could affect a weak solder joint turning it bad, damaged a sensitive part like the LCD, or got hot enough to make a piece of rubber perma-sticky, or got oil where it shouldn't be. So I'm not doubting that heat killed the F5, just the suggested mechanism.
Someone mentioned Compur shutters and the cold. One thing I have noticed is that most Compurs have a decent amount of molybdenum grease (or a graphite paste??) in them. Not the lightest grease and not the smallest amount. Not sure how much was factory lube or standard repair practice in the '50s or so. If you are shooting in the cold regularly it might be good to have the shutters cleaned up and greased with a lighter grease that will work better in the cold.
It looks to me as if the blades, especially the one in the left upper corner, were damaged by someone who repaired the shutter long ago.When I got the camera in, everything was fine. Shutter release and wind release synced, shutter fired smoothly, etc. I was wondering, then remembered the heat issue.
Attached is a photo of the shutter blades. And then they ate each other up more in use?
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