I found some VERY good offers for super8 film cameras like these:

http://www.super8data.com/database/cameras_list/cameras_revue/cameras_revue.htm

http://www.super8camera.com/netsearch.php?sq=canon+518&page=2

http://www.super8data.com/database/cameras_list/cameras_nizo/nizo_156xl.htm

http://super8arena.com/braun-nizo-4080-p-188.html

Unfortunately, I heard from the sellers that they have unchangeable lenses.

As I understood the zoom distance of this lenses can be changed from a button on the camera body, so probably it would be difficult to take off the lens from the cam... One of the sellers told me the lens has electric control of the zoom and the aperture is changed also from the camera.

I don't know anything about this, but these zoom lenses are pretty fast and VERY cheap (Revue Reflex Zoom f: 1.7 \ F: 8-40 mm and Canon 9.5 - 47.5mm f/1.8 and especially Schneider Macro-Variogon 1,4 / 7 - 80 mm from the Brown cameras) .

I think they could be useful for GH2/3 with a ETC mode, so I wondered if someone already achieved some adaptation of this lens type to micro 4/3?

Thank you in advance.