Tripod Mount Ring B (W) for Canon 70-200mm f/2.8L is II USM & EF 100-400mm f/4.5-5.6L is USM

Awesome! Just like the original mount but way cheaper.

After finding a crazy deal on a 35-350mm on eBay, I was only missing a tripod ring. Now this lens is by no means new, so finding one that said it would fit was super difficult unless I wanted to send Canon a bunch more of my money. Even though the listing doesn't specifically say that it fits, I started researching and doing some cross-referencing and then took a chance. Luckily it fit like a glove and has be performing flawlessly!

When I had this lens that it was attached to it was perfect

The price point on this is great and it has held up as I use the camera with the lens in secures nearly every week.

My only gripe is that the base plate was loose.I needed to buy an Allen wrench to ensure that it was tightwith both fasteners.That's the reason why I rated it 4 out 5 stars. It should have been tight to start with and not require an Allen wrench purchase.OEM Canon's is one piece.On the other hand OEM Canon's is part plastic Which breaks if you drop it.This one is all aluminum that won't breakIt balances my lens and camera on the tripod as advertised.Some other reviewers said it wouldn't align correctly for vertical pictures.I had no problem getting vertical alignment.You just have to take your time,watch where it lines up and notrush or force it.Other reviewers said it wouldn't work with their tripod base plateI had no problem with the base plate on my tripod.Secured to the support ring with no problem andwas firm and steady on my tripod.Just tell the workers back in China to make sure that the Allen wrench fasteners are tight before theypackage it.If you use Canon's big glass you need this if OEM tripod support ring doesn't come with the lens.Or if you break the original.Your pictures will thank you.

The diameter on the collar should match this lens but there are 4 small screws along the circumference of the lens that prevent this, even with the foam. The collar can’t be clamped shut since it doesn’t reach all the way around. Unknown if this is also true for the mark II version of this lens.

I got what seemed to be a manufacturing error, and since other reviews have been very positive I assume it's a fairly rare one. The holes for the screw to secure the two sides of the collar together don't align (as you can see in the pictures). The product overall seems pretty solid to me and I was impressed with the quality of the materials. The entire thing is metal, and it has a plastic insert to protect the lens from scuffing. It also has a little ridge for the nails sticking out from the lens to fit into so that once the collar is on and loosened slightly it can slide around without falling off entirely (I assume, since wasn't able to fit it to my lens). It matches the lens color pretty well, and the joint of the collar seems secure. I'm going to return it and try again, since the product itself was so good. Considering Canon no longer manufactures tripod mounts for this lens, I'd say this is a decent alternative --as long as you get one that'll actually screw on to your lens.

Spent hours scouring the web for a collar for this lens. Can't even find it on the Canon website...had to call Canon parts for information.Ordered this one only because someone else indicated it would fit this lens. They are correct. It is very similar to the collar from Canon for my Canon 70-200 f/2.8 IS USM. Differences are that this one is hinged, doesn't have the cut outs to slide on over the little lens bolts and color is just slightly different. BUT....Color - could care less that it's slightly different.No cut outs for the bolts - not a problem because it's hinged which allows for you open it up enough to put on over the little lens bolts rather than slide on like the Canon one does, and on the inside there is a grove wide enough to allow for the little bolts to sit in it nicely.Added bonus is there are two tripod mount sizes vs. the Canon one which only offers one size.There is no problem working the zoom ring with this collar on.Paid $130 for the Canon one with shipping and sales tax, so I'd order this one again any day. Although the shipping was quoted as longer in my confirmation, I received in 10 days. Not too bad!