Canon Tripod Mount Ring B (B) - Tripod collar

Although the product works fine, for the $150, they could at least include a diagram and instructions!! I never would have figured it out by myself! So thank you to the internet trawlers who answer questions from distressed customers!!

I bought the mount ring on the recommendation of a photo class instructor who said it would better balance the camera/lens assembly and allow me to rotate the camera from horizontal to vertical format. I mounted the assembly to my Canon 30D camera and...

If you need this for your lens, and it its gonna be tough not to, there's more or less only one manufacturor to get it from. So ... get it. Just don't lose the inner ring. Oh, the mount works just like the product description says it would, and the...