Jan Steinman wrote
>...An interesting side-effect of glass creep is that if you consistently
store
>your lenses in one direction, either filter-end down, or mount-end down,
>the glass creep will eventually change the focal length. (This is, in fact,
>how aspherical elements are developed...)...
This may go some way to explaining the recommendation to store lenses
in pyramid shaped containers to make them sharper (or was that for
razor blades?)
Regards,
Keith Berry
keith_r.k.berry@xxxxxxxxxx
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