I have several old,some very old cameras which have due to obviously wrong storage developed fungus inside the lenses. I am a retired engineer, but do not know how to remove the lens front without doing...
This is a tricky job- you have to be able to reassemble not just the lens components but the aperture diaphragm and focusing components. There are lots of little springs that jump out and sometimes tiny loose ball bearings.
But if you feel confident- most front lens elements are held in by a retaining ring that can be unscrewed. On older lenses this is obvious, with a couple of slots in the retaining ring, one one each side. You need some kind of tool to engage these slots without slipping and scratching the glass. I have actually used the points of the blades on a pair of scissors, but this is obviously not to be recommended.
On later lenses, there may appear to be no slots. Usually this means that the actual retaining ring is hidden behind a dummy. If that is the case, and there is no way to be sure but to try, you can unscrew the dummy ring by using friction, with a disk of rubber cut from an old innertube pressed against it, or maybe a rubber glove. This ring does not have to be screwed up very tight, as it is only cosmetic. Sometimes this ring is the outer surface of the front end of the lens housing, and sometimes it is an insert.
Sometimes it is easier to get at the inner surface of the front element by disassembling the lens from the rear, which is usually a matter of removing a lot of tiny screws.
However you get in, you are likely to find that removing the the mold does not clean the lens completely. It will have etched faint lines into the lens coating, and you will also introduce a certain amount of dust, which I have never managed to eliminate entirely.
Oct 20, 2010 |
Canon Camera Lenses