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Today my Nikon d90 was drop with attached Nikkor 18-200mm lens. The lens detached from the body and ripped of the metal ring with screws from the body. How can I fix it? I don't know how to remove the ring from the lens. Is there a trigger that releases it or should i just try to rotate it with force?

Camera: camera without mount ring

Lens: lens with mount ring

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1  
Oooo, man... now I've seen it all and am prepared to die... ;-) We already had questions on stuck filter rings, but I can't recall anything like that. How can this physically happen? –  ysap Jun 2 '12 at 23:09
    
It hit concrete floor from around 1.5m. It was in a solid bag and only beacause of that it is not in the pieces. –  Thomas Jun 3 '12 at 18:44
    
Ha, I see... well, this is certainly bad. I have suffered a comparable damage in similar circumstances - two of my lenses fell of a bag on a stone floor. The ultrawide became 14-22mm instead of 10-22mm 8-( –  ysap Jun 3 '12 at 19:36
    
Few years ago my d40 with nikkor 18-135mm felt from a 40cm high bench. They were in (crappy) bag and, in the end, both body and lens were damage. The actuall impact was way less than this time and 18-200 is much heavier. Moreover this time impact momentum was towards the lens. Let's see how it will end. I guess it is a good idea to detach heavy lenses from the body when travelling. –  Thomas Jun 4 '12 at 6:49
    
Just tested lens with other body and it is fine. The body looks good aswell the only problem are screw threads. –  Thomas Jun 10 '12 at 6:23
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1 Answer

up vote 7 down vote accepted

F-mount lenses are locked in place by a small metal pin that pulls flush with the lens mount when you press the lens release button. This pin would be in the three-o'clock position when you're looking where the lens mount would be. On auto-focus bodies like your D90, there's a second pin for the focus motor that does the same, and it's at the seven-o'clock position. It's hard to tell from the pictures you posted, but the focus motor pin looks like it's intact; I really can't tell about the release pin.

What you'll want to do is examine the corresponding places on the lens mount and make sure one of the pins isn't sheared off and holding the lens in place. If it is, remove it carefully. Also check that the flanges on the lens and mount weren't bent during the impact. If everything looks straight and unobstructed, you should be able to remove the mount from the lens by turning it clockwise as you look at the lens from the rear. You will have to apply a bit more force than you usually would to remove a lens because you don't have the extra leverage you get from having the body attached. If the ring doesn't move, it's possible that the pin sheared off, got stuck in a weird position and has jammed up the works.

Repairing it will not be a do-it-yourself job. Tearing the screws from the housing will have damaged the threads, and I doubt Nikon would be willing to re-tap them, especially on the D90's plastic body. Re-attaching the lens mount yourself may not guarantee that it's parallel to the sensor, and you'll be forever wondering if it's going to give out and drop an expensive lens on the floor. Speaking of lenses, parts of yours may not be in alignment after being dropped.

My advice would be to remove the lens ring if you can, cap the lens, wrap the body tightly in plastic wrap to keep anything from entering it and send the whole thing to Nikon for evaluation.

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Great answer. I managed to get off the ring. I will check the condition once I will get back from holidays. –  Thomas Jun 3 '12 at 18:46
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