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I can not lock the button (at my finger) when I turn the ring to A mode. It locked at M mode normally. Is it serious problem, can I fix it by myself. Please give me some advises. Thank for your comment. enter image description here

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Lenses such as 70-200mm f/2.8 or 80-200mm f/2.8 are some of the most complex lenses made for mass production.¹

If you have to ask if you can fix it yourself the answer is almost certainly "No, you can not."

¹ You don't have to take my word for it. Check out some of Roger Cicala's lensrentals.com blog entries about teardowns of 70-200mm f/2.8 lenses: Lens Teardowns and Comparisons of the Canon 70-200mm f2.8 IS II and III and Lens Teardown of the Complicated Sony FE 70-200mm f/2.8 GM OSS: Part I and Completing the Teardown of the Sony FE 70-200 f/2.8 GM OSS: Part II

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  • \$\begingroup\$ Thank for your response. I know that it's hard to fix by myself. Because I didn't find the place where can fix this problem in my local area except Nikon center. This center in my country has very poor service. :(( \$\endgroup\$
    – TommyDo
    Commented Apr 11, 2019 at 1:21

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