Nikon D3400 has no mic port? Best alternative to record audio?

Nikon D3400 has no mic port? Best alternative to record audio?

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How do I use my Nikon D50 with a 50mm 1:1.8 D lens manually?

I've always used it on Auto with a 55-200 DX Zoom but now I need to shoot some stuff at f. 22… With the 50mm fixed lens. The pose/time doesn't matter because its still life and on a tripod.
But I've lost the instruction manual and can't remember how to do it… Nor how to use the timer…
Thanks

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What is the merely translucent dried red liquid in my camera lense?

I believe it might be leaks from being in the sun. They re near the screws in the lense of my Nikon D5100.

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