I had some "once in a lifetime" shots today of the historic snowstorm, and the last several are sure to be overexposed.
Maybe not so much. The mirror sticking in the up position most likely has nothing to do with the shutter opening and closing. The mirror is not the shutter so its entirely possible that your photos are fine
I'm surprised as well.
For starters it wasn't that cold that you should have any issues. Maybe the suggestions that the lube is old make sense.
I've had the same problem with the copal shutter in my 300mm view camera lens this year but it isn't that old... I think I'll get the lube done.
I have heard of photographers using a dedicated body with the lube removed for extreme cold.... but that was years ago when cameras didn't do as many tricks. The theory was the cold would shrink the metal slightly and you wouldn't need lube. No idea how well it worked and I'm not suggesting you would need any treatment like that in this day and age.
With regard to the shutter, I understand that the mirror is independent of the shutter. I mentioned the slow mirror because with the first F-1N that failed, the mirror had been exhibiting the same behavior, and the problem turned out to be with the shutter. It is an involved and costly repair (see my original post).
Likewise, such is why I am leaning toward thinking that the problem with the second F-1N is beyond that of a normal CLA. I understand what some are saying here--that it could be an age/lube issue. However, this was not the case with the first F-1N that failed...and both cameras have the same symptoms (i.e. a mirror that gets slower and slower...).
My New F-1 that I bought used had the same problem, so I sent it to CLA once, that was at Canon, and I was told that the problem was caused by the lack of oil/grease because it had been sitting on a shelf for a long time. So once the CLA was done there, it was fine and still is today.
I had left my Pentax Spotmatic in the trunk of my car overnight during at -45C (-49F) one December in Edmonton Alberta Canada.(This was about 1979) I was able to wind it on and take a picture. I could meter as well, but it was a little hard to turn the meter on.
When I tried again the film broke. I was able to process the film later and found the last shot to be fine.
The film broke like glass!
My vote would be for a slightly worn out Pentax Spotmatic with a slightly worn out 55mm Takumar.