How much noise does your 16mm generate?

Make Love Not War!

You need an external recording device like a Nagra, DAT, Mini Disc, or a decent laptop. The main problem you have is keeping your sound and picture in sync, particularly if you are using any tape-based media (inc. digital media).

The problem is that there might be subtle speed variations in the speed of your tape recorder or your camera, and although not noticable at the time, it can easily cause you to lose sync. Many 16mm cameras are able to send out a sync (aka pilot) signal to keep an audio device in check. See the question on "crystal sync" in the FAQ.

The comment from another user about camera noise is also a consideration, since not all 16mm cameras are suitable for sync sound use due to the noise they make when you use them.

filmmaking.net

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filmmaking.net
(Incorporating the Internet Filmmaker's FAQ)

Please note the opinions expressed here are those of the author only and do not constitute legal advice. The author cannot accept and liability whatsoever for inaccurate or outdated information contained within.
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Yes this is what the clapper is for.

Depending on the noise that your camera generates use a recording device of your choice and also, if you don't already use it get a clapper.

For sync, in the editing room/suite/wateva look for the first frame where the clapper lever hits the main part and match it up with the clapping noise in the sound track. This technique has been used since the begining of sound productions and is still employed today even on blockbusters as the best way to get sound in sync.

Also as Filmmaking.net said your recording device/camera may be go out of sync after a while, for this i can only suggest trying to keep your takes quite short and also look itno crystal sync.

Thats my two cents, cheers

Make Love Not War!