Nikon D850 - 200-500 just comes off...

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J

Joel

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I have a D850. Every now and then, lately, my 200-500 (I call it Tonboy) just seems to come off in my hands. At first, I thought I was ham handing the button or something. It doesn't happen when I force it, though. I can twist and pull - doesn't come off. Then every now and then, poof, I realize it's loose. I notice my 70-200 and 20 prime don't go on as smoothly as they did. Ever hear of such a thing? Can the ring go bad?
 
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I just recently had the same but much more destructive situation with my Z7 and 600mm FL. It has happened twice, first time the lens just came off and i was able to somehow manage to catch the Z7 with my right hand and the 600mm with my left hand and upper body. The second time I wasn't so lucky. The Lens ended up coming off the FTZ adapter and fell to the ground landing on the back ring and bending the ring and damaging the contacts. I have sent it in to NIKON Canada and received a $1200 repair bill. It is in Parts Hold status and they have no idea how long it will be for the parts to arrive from Japan. I have always been careful with my equipment and do not lift the lens by the camera body, so like you I thought i must have somehow touched the lens release button on the body.
 
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Wow, not good reading of Lenses just falling off as this is concerning. I have the D850 and a 200-500 f5.6 and very careful in handling and conscious to try to support that Lens when handholding. Some of my Camera Gear is insured for accidents like this for a little piece of mind. I had a brand new 24-120 f4 that I tripped walking in the sand and the only damage was too the Lens Hood. Lucky....
 
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Examine the slot on the rear of the lens mount to see if the sides are sharp and vertical. Check the pin on the camera mount to see if its bent rounded or distorted. If both are good then you are catching the release button and not aware of it . If you are not convinced put some double-sided tape over the button and you will feel when you touch it .
 
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The 200-500 and other heavy lenses mounted on camera's need to supported only by the lens (handhold or on a tripod). If your also handholding the camera there is the possibility of significant sheering and deforming forces working on the relatively weak lens mount as the support won't be even. If both the camera has additional weight on it - a Grip - both the camera and the lens need support. If you use a mounting rail with a lens foot both will be supported and no shearing/deforming force will result. It will greatly reduce the likelihood of the lens unexpectedly falling off.
 
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