Le dimanche 20 Mai 2007 23:42, Moose a écrit :
> It is again my recollection that there was at least one report of haze
> starting to return on an element that had been cleaned. As many sources
> have said that the damage can become permanent if not treated promptly,
> my conclusion that checking and recleaning would be wise/needed is one
> of logic, not personal experience.
It is my understanding that most haze problems come from fungus (don't know
for that specific lens). Fungus is a pain to clean, but is generaly very
sensitive to daylight. So I just leave my lenses uncapped out of their carry
boxes, mostly facing a window. So far, no fungus, except for one camera I
bought knowingly already infected, cleaned, and left alone : to this day, the
fungus didn't came back although the lens is etched (gives a rather nice
"soft" effect to pictures). One possible side effect of my method is to speed
up the yellowing of some "radioactive" rare-earth enriched glasses (such as
the famous pentax 50/1.4) ; but those lenses are doomed to this fate aleady,
so... Another potential issue exists with RF cameras having clothed shutters.
Unlike a reflex, thoses cameras have no mirror to block the sun rays on their
way to the shutter, and this can create a pinhole in the fabric of the
shutter by burning through. So the lens must be removed from the body if left
exposed to constant daylight.
--
Manuel Viet
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