Francisco,
http://www.everythingretek.com/PRDLi...ES/MP4USER.PDF
The MP-4 lens board is round.
This device
http://www.ebay.es/itm/Polaroid-MP4-...-/161252174485 confuses nearly everyone who sees it. With the right Polaroid adapters a Tominon lens for MP-4 (in barrel, they're all in barrel) can be reversed and mounted behind a Polaroid MP-4 shutter. The adapters, which include a special MP-4 lens board (that's the board the shutter is on, it includes and aperture lever and scale), make it possible to adjust the lens' diaphragm. The shutter shown in the listing is a perfectly normal Polaroid MP-4 shutter with no diaphragm.
Because the MP-3 and MP-4 systems and, for that matter, the CU-5 and other gelcams all use #1 shutters, swapping lenses around between them is easy. I think you're confusing systems that users cobbled up with what Polaroid actually offered for sale.
I don't disagree at all with what you saw. I disagree with your interpretation/understanding of what you saw.
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