[pure-silver] Re: Exercising a shutter
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 12 Feb 2011 21:56:47 -0800
----- Original Message -----
From: "Jeffrey Thorns" <puresilver@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, February 12, 2011 4:00 PM
Subject: [pure-silver] Exercising a shutter
I have a 4x5 Cambo that I haven't used in about 15 years.
It has been stored in good conditions (uniform humidity and
temp), but I was wondering about the shutters on the
lenses.
I have a 210mm Caltar in a #1 Copal shutter and a 150mm
Symmar in a #0 Copal shutter (I think). They haven't been
touched in over a decade.
Is there some sort of prep I need to do to them before I
begin using them again?
Test the shutter using a shutter tester if you have
access to one. There are alternatives using a computer sound
card, a Google search should find them. If the shutter is
sticky it will need to be cleaned. Even if excercizing it
seems to free it up there will still be hardened lubricant
and accumulated dirt in it. Do NOT spray solvent into it,
the solvent will get all over places you don't want it like
the shutter and diaphragm blades.
Copal shutters should be fairly easy to work on, the
ones I've seen were more like old Wollensak shutters than
anything else. That's actually good, Wollensak made very
good shutters, its too bad their lenses didn't match.
Check the lenses by shining a flashlight _through_
them. Look for haze or dirt inside. Many lenses will develop
a coating of haze inside the air spaces. Usually, its not
difficult to clean out but even a slight haze has a
devestating effect on image contrast.
My guess is that both lenses and shutters are fine.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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