The screens are made of relatively soft plastic and the surface can
easily be damaged. That having been said, they are at the same time
relatively well protected in the camera -- the greatest risk is when
they are being installed or removed, and when out of the camera. Simply
touching them may leave marks, but these can often be removed by
carefully washing in warm, soapy water. They can be scratched or marred
as well, and in older cameras the mirror pads (made of the same material
as the back foam) may turn to "muck" and get onto the screen -- all of
these types of damage usually leave permanent marks. Still, the screen
will probably be useable, though the marks may be distracting. Cracks
are quite rare, though, and occur only with severe abuse. Worst is
melting -- but if things get hot enough to damage the screen, that's
probably the least of your worries!
Sure, if you've got the chance, you might try to pick up a new/used
un-blemished spare screen, just in case -- it might come in handy if you
decide to sell that body and want it to look it's best.
plp@xxxxxxxx wrote:
>
> Has anyone here trashed a focusing screen, or heard of someone
> else doing it? Is it worth buying a spare of the same type?
> An OM-4Ti would be difficult to use without one, but just how
> fragile are focusing screens?
>
> Pete
>
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