On Fri, 11 May 2001 10:46:41 +0200 "george jiri loun"
<[EMAIL PROTECTED]> writes:
> Tony,
> I dare to question what you wrote... While you are right to say,
> that felt is quieter than foam used to dampen the mirror slap, just for
the
> reason you mention (felt gets progressively firmer when compressed) it
gets
> harder and harder with time and thus more inclined to conduct the
mirror blow
> through the camera. It will still be quiet but much less dampening
than
> foam after prolonged use! That's the reason why manufactures use foam
nowadays
> rather than felt. (lack of the felt has nothing to do with it...:-))
George
Hi George,
I this particular application, I have found felt to be superior for
damping mirrors as well as sealing camera backs. I am still using cameras
that I rebuilt in the early '80s and there is no degradation of the felt.
Most of my working camera collection is from the '50s and '60s, I use
them on a daily basis. The greatest pleasures in hearing the solid sound
of a well maintained antique camera shutter firing is processing the film
that comes out of it.
Foam rubber is cheaper and easier to apply during assembly than fabric
based materials. Most older cameras used a very thin velvety material
that is still serviceable. Cameras are not the only victims of rubber
goo, film projectors and 8-Track players suffer the same problem. OK we
can forget about the 8-Tracks, but while many Super-8, Std-8 and some
16mm projectors use rollers made of this rubber. A recent urge to watch
some 8mm movies was dampened by an apparent drive problem. Upon
examination, the rubber friction rollers oozed off the spindles and
gummed up everything on the way to the bottom of the projector, trying to
run film through it did not help as the goo was splattered all over the
innards :(
Tony Ascrizzi - Electric Vehicle Systems
34 Paine St.
Worcester, MA 01605 (508) 799-5650
Web Page -->http://ElectricVehicleSystems.com
President -->New England Electric Auto Association
http://www.eaaev.org
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