Ok so four hours in the oven at 200 degrees dries a lens out nicely, the
auto focus works just find, but there are water stains on the elements, it
will be interesting to see what the photos look like, perhaps a little soft,
I used a lens on my RB67 that had a crack in it for years, never could tell
a difference.
Thanks
Terry L. Mair
Mair's Photography
158 South 580 East
Midway, Utah 84049
435-654-3607
www.mairsphotography.com
----- Original Message -----
From: "Roger Eichhorn" <eichhorn@xxxxxx>
To: "List for Photo/Imaging Educators - Professionals - Students"
<photoforum@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Monday, October 03, 2005 7:26 AM
Subject: Re: warer in lens
I meant slightly above the temperature of the lens. And, yes, things do
dry out in a refrigerator, but the air in the refrigerator is likely to be
saturated with water vapor and evaporation will be slow and essentially
stop when the lens reaches the temperature of its surroundings. If you
try that, put it in a sealed plastic bag when you remove it from the
refrigerator until it reaches room temperature. Otherwise, moisture from
the air will condense on the lens putting you back where you started.
After it reaches room temperature, put it back in the refrigerator and
repeat the process. It's hard to say how many times you would have to do
this. I wouldn't put it the freezer. The water would freeze expanding as
it does so. That might further damage the lens. An oven set at the
highest operating temperature the lens manufacturer recommends might be
the best bet. A discussion on the thermodynamics of the processes
involved would be lengthy and possibly confusing.
Roger
Roger Eichhorn
eichhorn@xxxxxx
On 3 Oct 2005, at 07:31, Gregory Fraser wrote:
This can be done either by
lowering the ambient pressure in an evacuated chamber, or by placing
it in an oven whose temperature is slightly above (+20 degF,
20 degrees Farenheit? My refrigerator is above 20 degrees Farenheit will
that do?
