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Stiff focusing ring
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PostPosted: Sat Sep 20, 2008 10:28 pm    Post subject: Stiff focusing ring Reply with quote
I have noticed that if you leave a lens with stiff focusing ring, near a warm place (not hot, just warm), like a portable hard disk, after a while it becomes very easy to focus. Unfortunately, back to ambient temperature, it becomes stiff again.
I think that a chemical alteration to the grease happened, in the stiff lenses, that raised the temperature point at which the grease becomes fluid.


PostPosted: Sat Sep 20, 2008 11:55 pm    Post subject: Reply with quote
Yes, this effect is a real danger at summer time for blades.
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