Can you take a picture of that... evidently I don't know what a flange is.
Let's see if this works. I'm out of town and don't have a computer but i will try to upload one from the ipad.
[Oh good, I see it went through. Attached pic is from 135L b/c I didn't bring 85L on trip. But groove is the same.]
« Last Edit: June 06, 2013, 11:50:21 PM by CANONisOK »
5D mark 3: R14/2.8, 24mm f/2.8 IS, 35mm f/2 IS, 50 1.2L, 100L macro, 85L, 135L, 300mm f/2.8 ii. 8-15L Fisheye, 16-35L, 24-70L II, 70-200L IS II, TAM 150-600mm, 2x600ex-rt
EOS M: 18-55mm, 22mm
SL1: 10-18mm IS, 18-55mm IS