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Lens Cell Cleaning



 
 
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  #1  
Old February 10th 11, 01:26 AM posted to rec.photo.equipment.large-format
[email protected]
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Posts: 428
Default Lens Cell Cleaning

On 2/9/2011 10:41 AM, Cheesehead wrote:

And the rear has a ring holding it in place, which should be removable
easily with a spanner wrench.


I'm not sure what you are saying here but do NOT remove the glass itself
from it's mount but unscrew the whole cell from the shutter to clean the
front/inner surface and you can also clean the rear of the front element
while you are there by opening the shutter.

Stephey
  #2  
Old February 10th 11, 04:41 AM posted to rec.photo.equipment.large-format
Richard Knoppow
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Default Lens Cell Cleaning


wrote in message
...
On 2/9/2011 10:41 AM, Cheesehead wrote:

And the rear has a ring holding it in place, which should
be removable
easily with a spanner wrench.


I'm not sure what you are saying here but do NOT remove
the glass itself from it's mount but unscrew the whole
cell from the shutter to clean the front/inner surface and
you can also clean the rear of the front element while you
are there by opening the shutter.

Stephey


If its a standard Triplet the back cell will be a single
lens so there is no need to remove the glass. The front cell
will have two elements. Usually in larger lenses there is a
threaded back cap on the cell but it may have a retaining
ring on the front which is more common for smaller lenses.
If a back cap its easy to remove. The elements are clamped
between concentric edges in the cell so are automatically
centered.
If the cap is too tight for removal with simple finger
grip use one of those rubber jar grippers. It won't mar the
surface. If you grip too tightly it will clamp it and make
it even harder to remove.
I agree with the others about cleaning but if the lens
is oily the standard optical cleaner is pure acetone
followed by dry isopropyl alcohol. Window cleaner like
Windex may streak the lens if not followed by alcohol. The
newer butyl alcohol "streak-free" cleaners are better.
While ammonia is alkaline and strong alkalies can
dissolve some kinds of glass there is no real danger from
the very dilte ammonia in Windex and similar cleaners.
If you use acetone be careful of the edge paint, if any,
and of the paint on the cell because it will dissolve both.
I do not recommend cleaning inside elements when in a
shutter because there is too much danger of getting the
cleaning fluid into the shutter, take the cell out.


--
--
Richard Knoppow
Los Angeles, CA, USA



 




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