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<blockquote data-quote="JimL" data-source="post: 846050" data-attributes="member: 69920">Hello,I’m new here so not sure if this is right place to post this.I currently have my 200-500 nikkor f/5.6 lens away for an expensive repair. I am going to sell this once I get it back as I now have a 500 pf and only very rarely used the 200-500 at other than 500.My question is a more general one about how the damage may have occurred so that hopefully I can avoid similar in the future.I bought the lens new a few years ago and used on d610, 750 and 780. Sometimes with 1.4 converter. I progressively noticed a small amount of play at the mount and camera said f/0, ERR, and failing to focus. Usually if I tried to rotate the lens the issue would go away temporarily- but eventually it was happening too often. I was told there was an electrical fault and internal damage to the diaphragm and lens mount and tube needed replacing. I don’t ever remember dropping or bashing the lens. I often carried it at my hip on a strap when walking.Any ideas how damage might have occurred? And tips on preventing in future? Or have I just been unlucky? Possibly issue got worse when I started using the teleconvertor- is that possible?Many thanks in advance.</blockquote>

[QUOTE="JimL, post: 846050, member: 69920"] Hello, I’m new here so not sure if this is right place to post this. I currently have my 200-500 nikkor f/5.6 lens away for an expensive repair. I am going to sell this once I get it back as I now have a 500 pf and only very rarely used the 200-500 at other than 500. My question is a more general one about how the damage may have occurred so that hopefully I can avoid similar in the future. I bought the lens new a few years ago and used on d610, 750 and 780. Sometimes with 1.4 converter. I progressively noticed a small amount of play at the mount and camera said f/0, ERR, and failing to focus. Usually if I tried to rotate the lens the issue would go away temporarily- but eventually it was happening too often. I was told there was an electrical fault and internal damage to the diaphragm and lens mount and tube needed replacing. I don’t ever remember dropping or bashing the lens. I often carried it at my hip on a strap when walking. Any ideas how damage might have occurred? And tips on preventing in future? Or have I just been unlucky? Possibly issue got worse when I started using the teleconvertor- is that possible? Many thanks in advance. [/QUOTE]

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