The haze on the 65-200 is suspected to be due to oil migrating to the
lens. Putting the lens in a nice sunny window might make it worse. I
don't know how the "cement" used in double elements reacts to sunlight
(I believe sunlight is used to cure one type of cement). You might
damage your lens with repeated temperature cycling and stong sunlight.
Finally, strong sunlight could help fade the paint on the lens. If
your lens has a fungus infection, these risks are small compared to
the benefit of killing the fungus. If you are unlikely to get a fungus
infection, then the preventative "cure" probably isn't worth the risk.
YMMV,
-jeff
On 5/20/07, Manuel Viet <oly@xxxxxxxxxx> wrote:
>
> 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
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|