topic Tripod mount on EF 300 F:2.8 IS L series no longer rotating smoothly. in EF & RF Lenses

Tripod mount on EF 300 F:2.8 IS L series no longer rotating smoothly.

HPL — Wed, 18 Jun 2025 03:46:55 GMT

I have a Canon 300MM F:2.8 IS L series lens and the tripod mount collar is no longer rotating smoothly. This is the original EF lens and I am sure that the bearing surface has become worn. There is a plastic ring that I believe needs replacing. Any idea where to obtain that part?

Thanks

Re: Tripod mount on EF 300 F:2.8 IS L series no longer rotating smoothly.

shadowsports — Wed, 18 Jun 2025 06:20:21 GMT

Greetings,

If I have identified the lens correctly, I believe it was released in 1999. If so, it's unlikely that Canon will still have parts for it.

Telephone number for the Cannon parts department. : 1-866-481-2569,

Other possibilities might be eBay or us camera dot com.

Re: Tripod mount on EF 300 F:2.8 IS L series no longer rotating smoothly.

ebiggs1 — Wed, 18 Jun 2025 14:52:01 GMT

Have you tried a small amount of white lithium grease. Small means tiny as a little is good but a lot is not. I almost can not see you wearing out a part on that lens especially the tripod collar mech.

Re: Tripod mount on EF 300 F:2.8 IS L series no longer rotating smoothly.

HPL — Wed, 18 Jun 2025 18:14:01 GMT

Yes, it is absolutely a "legacy" lens, so no, Canon no longer services it.

Re: Tripod mount on EF 300 F:2.8 IS L series no longer rotating smoothly.

HPL — Wed, 18 Jun 2025 18:17:36 GMT

It's the teflon liner that has worn down just enough to cause metal to metal contact. I have considered a bit of graphite but he lithium grease might be another possibility. I'm hoping that the Mk II will have the same teflon bearing though. Thanks for the parts dept number.

HPL