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![How do I fix the problem on my Nikon D3400 saying "lens not attached" for a Vivitar series 1 500 mm manual Telephoto lens? - Photography Stack Exchange How do I fix the problem on my Nikon D3400 saying "lens not attached" for a Vivitar series 1 500 mm manual Telephoto lens? - Photography Stack Exchange](https://i.stack.imgur.com/bVkQp.jpg)