Audio Adapter

Maybe.

It is not possible to give any better answer without knowing exactly what microphone you are talking about.

Being vague about details limits us to vague responses.
 
As Richard rightly says we need more info as the mic may be stereo and the BMCC inputs are stereo so you would therefore need a splitter to feed the stereo 3.5mm jack to two 6.5mm mono jacks!

If the mic is mono with a balanced 3.5mm connector the BMCC has two balanced 6.5mm TRS jacks so you could use a stereo TRS 3.5mm to TRS 6.5mm adaptor but it will only feed one input, if you require both inputs to be fed then you need a 3.5mm to 6.5mm splitter.
 
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@NorBro, this appears to be what you need:

http://www.bhphotovideo.com/c/product/160639-REG/Hosa_Technology_CMP_153_Stereo_Mini_Male_to.html

160639.jpg

Reason: Your Shure VP83F microphone/recorder has a "Camera Connector: 1 x 1/8" (3.5 mm) dual mono unbalanced" output.
That means the tip and the ring have the same (mono) audio signal from the microphone.
If you use a conventional TRS cable/adapter, you will be feeding identical audio (fake "Left" and "Right") into the balanced mic input of the BMCC.
That will virtually cancel out all your audio and you will get almost no signal at all.

So what you need is something that takes the "Left" and "Right" unbalanced signals out of the VP83F and feed them into the balanced mic inputs of the BMCC.
That is what that cable is designed to do. Note that there is also a "premium" version of that cable. http://www.bhphotovideo.com/c/product/846982-REG/Hosa_Technology_HMP_003Y_REAN_3_5_mm_TRS.html
Also, you may find the same kind of cable from other vendors.

Simple adapters may have only a 50% chance of working in this configuration.
The simple adapter you asked about originally MAY work. But, of course, it will feed only one channel of your camera.

Note also that a microphone mounted on top of a camera is just about the worst possible place for decent audio pickup.
 
Richard - thank you! For run and gun, I really have no choice without an audio guy with me, but I at least have it on top of my cage with nice suspension. Does that make a difference at all?
 
Not so much. The real problem is distance/proximity. On top of the camera is typically TOO FAR away from the subject, and TOO CLOSE to the camera and operator sounds.
 
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