On 22/01/2009 22:39, Paul Koning wrote:
Then there are fun details like this one: ethanol
is a nice harmless
cleaning fluid for many things, including most plastics. But it will
turn plexiglas matte.
And never use IPA to clean the focus screen in your SLR camera. I had
to have a Pentax dismantled and the screen replaced after that one.
Thad depends on what the focussing screen is made of. Some of my cameras
are old enough to have real ground-glass screens, which are not attacked
by any common cleaning solvents. But the plastic ones used in more recent
cameras are very easy to damage. Having just looked at a Spotmatic, I can
confirm the focussing screen in that is plastic, and that it comes out
upwards arter removing the top plate and pentaprism, so it's not trivial
to replace.
-tony