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#1
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lens repair
I was working with an add-on +3 dioptre magnifying lens, the kind that screw
on like a filter, and dropped it. The lens came out of its mount but to my surprise neither the mount nor the lens itself were damaged. I found the retaining spring on the floor and worked out which way the lens went into the mount, it sits against a flange with the retainer on top in a slot inside the rim of the mount. I then set about replacing the retainer on top, it is roughly a circle of thin springy metal that has been cut. I tried putting one end in first and then working around to the other end but each time, no matter how hard I pushed it into the slot in the mount, when I got to the other end about 1mm was left overlapping. I tried pushing the two ends in opposite directions so that they would slide past each other down together into the slot. I tried putting the two ends in first and working the curve into the slot, hoping that it would pop inside the rim. Nothing worked. Clearly as it came out of the slot there must be a way to get it in. In the end I gave up and cut 1mm off the spring. The lens is now fine. Is there some way a normal tool-using human can get this retaining ring in or do you require special tools? David |
#2
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lens repair
On Thu, 15 May 2014 17:18:17 +1000, "David Hare-Scott"
wrote: I was working with an add-on +3 dioptre magnifying lens, the kind that screw on like a filter, and dropped it. The lens came out of its mount but to my surprise neither the mount nor the lens itself were damaged. I found the retaining spring on the floor and worked out which way the lens went into the mount, it sits against a flange with the retainer on top in a slot inside the rim of the mount. I then set about replacing the retainer on top, it is roughly a circle of thin springy metal that has been cut. I tried putting one end in first and then working around to the other end but each time, no matter how hard I pushed it into the slot in the mount, when I got to the other end about 1mm was left overlapping. I tried pushing the two ends in opposite directions so that they would slide past each other down together into the slot. I tried putting the two ends in first and working the curve into the slot, hoping that it would pop inside the rim. Nothing worked. Clearly as it came out of the slot there must be a way to get it in. In the end I gave up and cut 1mm off the spring. The lens is now fine. Is there some way a normal tool-using human can get this retaining ring in or do you require special tools? Heheh, I've had a similar situation once. An interesting puzzle. I think the only way to get it in without modifying it is to put the ends in first and then force the rest of the circle into the groove. I can't say how you do that without the retaining spring jumping out at the last moment. It will depend on your exact situation. Clipping a millimeter off solves the problem for now, but increases the chance the retaining spring will come out again some time in the future. You could put a drop of white glue on it to make it more secure. If you ever do need to remove it, white glue will soften in water. W |
#3
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lens repair
Wally wrote:
On Thu, 15 May 2014 17:18:17 +1000, "David Hare-Scott" wrote: I was working with an add-on +3 dioptre magnifying lens, the kind that screw on like a filter, and dropped it. The lens came out of its mount but to my surprise neither the mount nor the lens itself were damaged. I found the retaining spring on the floor and worked out which way the lens went into the mount, it sits against a flange with the retainer on top in a slot inside the rim of the mount. I then set about replacing the retainer on top, it is roughly a circle of thin springy metal that has been cut. I tried putting one end in first and then working around to the other end but each time, no matter how hard I pushed it into the slot in the mount, when I got to the other end about 1mm was left overlapping. I tried pushing the two ends in opposite directions so that they would slide past each other down together into the slot. I tried putting the two ends in first and working the curve into the slot, hoping that it would pop inside the rim. Nothing worked. Clearly as it came out of the slot there must be a way to get it in. In the end I gave up and cut 1mm off the spring. The lens is now fine. Is there some way a normal tool-using human can get this retaining ring in or do you require special tools? Heheh, I've had a similar situation once. An interesting puzzle. I think the only way to get it in without modifying it is to put the ends in first and then force the rest of the circle into the groove. I can't say how you do that without the retaining spring jumping out at the last moment. It will depend on your exact situation. Clipping a millimeter off solves the problem for now, but increases the chance the retaining spring will come out again some time in the future. You could put a drop of white glue on it to make it more secure. If you ever do need to remove it, white glue will soften in water. W White glue = PVA, commonly used to glue wood and paper? D |
#4
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lens repair
On Fri, 16 May 2014 09:18:59 +1000, "David Hare-Scott"
wrote: Wally wrote: On Thu, 15 May 2014 17:18:17 +1000, "David Hare-Scott" wrote: I was working with an add-on +3 dioptre magnifying lens, the kind that screw on like a filter, and dropped it. The lens came out of its mount but to my surprise neither the mount nor the lens itself were damaged. I found the retaining spring on the floor and worked out which way the lens went into the mount, it sits against a flange with the retainer on top in a slot inside the rim of the mount. I then set about replacing the retainer on top, it is roughly a circle of thin springy metal that has been cut. I tried putting one end in first and then working around to the other end but each time, no matter how hard I pushed it into the slot in the mount, when I got to the other end about 1mm was left overlapping. I tried pushing the two ends in opposite directions so that they would slide past each other down together into the slot. I tried putting the two ends in first and working the curve into the slot, hoping that it would pop inside the rim. Nothing worked. Clearly as it came out of the slot there must be a way to get it in. In the end I gave up and cut 1mm off the spring. The lens is now fine. Is there some way a normal tool-using human can get this retaining ring in or do you require special tools? Heheh, I've had a similar situation once. An interesting puzzle. I think the only way to get it in without modifying it is to put the ends in first and then force the rest of the circle into the groove. I can't say how you do that without the retaining spring jumping out at the last moment. It will depend on your exact situation. Clipping a millimeter off solves the problem for now, but increases the chance the retaining spring will come out again some time in the future. You could put a drop of white glue on it to make it more secure. If you ever do need to remove it, white glue will soften in water. W White glue = PVA, commonly used to glue wood and paper? There are many varieties. The kind I happen to have is Elmer's Glue-All. Carpenter's Glue is basically the same but is yellowish. This is not an intended use (best use is porous surfaces). But I break rules. In the olden days I used it to mount carefully-cut parts of plastic eyeglass lenses to my viewfinders to give fully corrected views with my glasses off. Adhesion was weak but satisfactory. The lenses could easily be removed, and left no mark on the camera. I also used it to secure a couple of set screws on a shaft. The glue jams the threads, effectively preventing the screws from working loose (which they did constantly before). So I think it should help to hold the ring. Crazy Glue would be more secure, but would be hard to impossible to remove afterwards. Either way it's your risk! W |
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