FTography
Contains Sarcasm
Not quite my 'artistic' sphere, but he does appear to use either an OM-1 or OM-2 with what seems to be the 135/2.8.Definitely NSFW but it turns out that Richard Kern is a Zuikoholic too.
See http://www.vice.com/shot-by-kern/in-canada-1
With the second girl he shoots, he appears to be using an OM-1 (or possibly 2).
(The 135/3.5 retractable shade has a smaller diameter than the outer rim of the aperture ring, while the 135/2.8's retractable shade is in alignment with the aperture ring's diameter. See 10:17 in the video.)