Turn glass outer disk cam to open or close the aperture of a camera.
Green inner disk is fixed.
Overlapping curved blades play role of cam followers.
Inventor files of this video:
http://www.mediafire.com/file/9ewqhab4silcehc/DiaphragmShutter3Inv.zip
See real colossal iris:
https://www.youtube.com/watch?v=jvEL3KahFsk
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