>>3410285The rear element of that Canon 50mm f0.95 fills the entire opening of the Canon 7 (it won't work on other LTM cameras since it needs a special bayonet to attach that only the 7 has.
In order for the rangefinder to work they needed to cut out part of the rear element so the feeler can attach.
It's just an all-round ridiculous lens and the pictures it makes don't even look all that great.
