What is the temperature range within which the FM10 will reliably function? I'm referring both to the movement of the mechanical parts (as some lubricants can thicken in cold weather#, and to battery power for the meters. I'd like to know both the official operating temperature range, and the actual one, as determined by practical experience from users.

On that note, should the batteries fail in cold weather #or for any other reason), are batteries required in order for the camera to have any functionality, or does it have the ability to release the shutter and cycle the mirror without electrical power?
If it does have a mechanical backup, is the shutter speed selectable, or is it locked at a specific speed, such as 1/60th of a second?

If, not what would be a good wide angle-zoom lens?

Thanks!

This Vivitar 2600 flash has served me well with my original minolta from the late 70s, my cannon from the late 80's and my last 35 mm Pentax K1000.

Will this work with my fm10? As it has worked with all those other cameras I see no reason why I would need to replace it.

Thanks

PS I like to take architectural photos which is not included below