KINGOFKNGS Offline Upload & Sell: On
|
| p.2 #1 · p.2 #1 · Hands-on: EF 200-400mm f/4L IS USM Extender 1.4X | |
rscheffler wrote:
I find the 600 more difficult to rotate than my copy of the 400.
From my understanding based on some research into this a few years ago on the Sportsshooter.com forum, there are two versions of the 400 IS v.1 tripod collar. It seems, IIRC, the earlier version, until maybe around 2005, which I have, has a design based on ball bearings supporting the rotation while the newer version uses some kind of low-friction pads (which is also what's used by the 600). If you have the BB version and it's tight, you might want to take off the lens ID cover and have a look at the retaining screw for each BB. If one has worked loose, it pushes up against the inside of the collar and makes rotation quite difficult. The problem here is that it will eventually jam and excessive force will break the BB package, releasing a lot of small metal bits to jam up the other BBs. This happened to me once, before I knew how to service it, and Canon's repair process is to replace the entire collar. I think it cost me around $400. But self-servicing is easy. Remove the ID cover's four tiny screws, which reveals a large opening. As you rotate the collar, you'll be able to inspect each BB. I think there are six in total. If you find a loose screw, tighten it down, though I would recommend some thread lock fluid as well. Before I used thread lock, I was tightening the screws every few months or so, but with thread lock it hasn't been an issue. If you remove the ID cover and it looks different, then you have the newer version and there really isn't anything that can be adjusted, from my understanding. Years ago at a CPS event, I had them look at my 600's tripod collar... they took it all apart but really weren't able to improve anything with it. Its tightness really seems to depend on whether or not I give a slight amount of lift at the front of the lens - if I do, it rotates more smoothly.
Hope this helps!...Show more →
Thanks Ron, my 600 is a UN date code and my 400 is a UR date code, I think, but it may be older. I'll check out the ball bearings on the 400 tomorrow. Thanks for the advice!
Ryan
|