Quote Originally Posted by Steve Smith View Post
I think this has been shown to be mythology as the difference in tension in an uncocked spring compared with a @#!*% spring is very small. i.e. in an uncocked state the spring is still in tension, probably around 80% of the @#!*% tension, in order to get a more linear response. If the spring went slack at the end of the movement there would be a huge difference in tension across the travel of the shutter resulting in it slowing down towards the end of its travel.

Steve's right. Also, springs do not look at clocks. Cycling the spring will add to the cumulative metal fatigue, too. But, have you ever heard of a valve spring breaking in an auto engine? In a four cylinder four stroke engine, at least two of the springs are under extra tension all the time. Breakages are extremely rare, as in unheard of.

Al that said, I don't leave either my cameras or my guns @#!*% .