Upload & Sell: On
UR is 2003. Mine is US... I found that SS thread and I might have mixed up the details.
One of the guys there had a UR lens and it had the BB-less collar design, which in hindsight kind of makes sense because IIRC, when the lens first came out, a lot of people complained about how difficult it was to rotate. If you have the BB-less design, I guess you could have Canon replace it with the newer style, though it will cost $500-600. Or keep your left hand under the front of the lens lifting it slightly to help...Show more →
I also owned a 400/2.8 IS with the UR date code, mine didn't have the ball bearing design.Mine got pretty tight to turn and I ordered the ball bearings that the Sportsshooter article referred to and when I disassembled it, much to my surprise, no ball bearings.More like a plastic bushing, which I ended up putting a small amount of white lithium grease on, which helped fo some time.