B4 to m4/3 lens adapter for Stusio cameras

Hello people! I'm offering here an adapter for b4 lenses to be used on studio cameras or any other m4/3 cameras. If you are here you probably know why those lenses are so great!
To cover the m4/3 sensor the 2x extender on the lens should be enabled, that would make the lens 2x darker, let's say you have a f1.6 lens, with the extender it became f3.2 lens, still great for a 20x zoom, right?

My adapter is based on bmd b4 mount so it has optical corrective element.
I would be happy to sell them for 600eur plus shipping, items are in Italy.

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Some other pics (forum is limited to 3 pics per post)

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The adapter can be used on rods or on a plate,I did 2x 3/8" holes, you can see them in the pics.
The lens needs to be powered, you need a cheap cable from amazon for that, so you can use zoom and focus remote control.