What is this device? I was doing some cleaning today and found the device below, unopened, in its original plastic bag. I'm guessing it's an accessory for a photo or video camera from the 8mm jack, but anything more than that is beyond me.

Anyone else know what it is?

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Interior:

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Aha! I found it. It's neither an audio nor a video device, but a Film Adapter Unit—a light source—for a CanoScan LiDE 700f. Misleading plug type.