What kind of movie were you planning on making? If you are going to be using an external mic then it will need to be shielded against handling noises so you'll need to use some kind of stand or boom or suspend is some way so you get clean audio. The bulky plug in is probably a 6.4mm (I think) so it's easy getting a convertor plug to reduce it to 3.5mm, is it a stereo mic (2 black rings on the plug) or a mono mic (1 black ring on the plug)?

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