36 with bigger rear element doesn't exist. All 36 (or "pre" version are exact same). You may mean the Cinegon, the only one with biggest rear optic but changes nothing on taking lenses that you can use: always 50mm is the minimum
and? he has it there 1 year, nobody touch this :p
but take a look at those too:
http://www.ebay.ca/itm/231811804520
http://www.ebay.ca/itm/172090214574