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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 |
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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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