The tripod mount of my Canon 300mm f2.8 with IS is damaged. The original collar has a P/N of YG9-0618. I have searched for a replacement to no avail. There are 'Canon Tripod Mount Rings A/B/C' will any of these fit this particular lens?

The Canon Tripod Ring B(B) (black) looks extremely similar. The original has a ID of 88mm and has an internal groove that 4 'runners' sit in with 4 grooves to allow the ring to be mounted.

  • \$\begingroup\$ Please confirm that the lens in question is the EF 300mm f/2.8 L IS (or whatever exact model name published by Canon it is that you have). \$\endgroup\$
    – Michael C
    Commented Aug 5, 2017 at 9:02

1 Answer 1


The Tripod Mount Ring B would be too small for your EF 300mm F/2.8 L IS lens. It is made to fit the MP-E 65mm f/2.8 1-5x Macro, EF 100mm f/2.8 Macro, and EF 180mm f/3.5L Macro among other lenses.

My EF 70-200mm f/2.8 L IS II uses the white version of the Tripod Mount Ring B which has an inside diameter of 78mm.

Tripod Mount Ring A (EF 70-200mm f/4 L IS and EF 70-200mm f/4 L, EF 200mm f/2.8 L II) is even smaller than Tripod Mount Ring B.

Tripod Mount Ring C (EF 70-300mm f/4-5.6 L) has an inner diameter of 82mm.
Tripod Mount Ring D (EF 100mm f/2.8 L Macro) is even smaller than Tripod Ring A.

The EF 300mm f/2.8 L IS has been out of production since the EF 300mm f/2.8 L IS II was introduced in 2011. As early as 2012 the ring was no longer available as a replacement part. Even third party knock-offs of the tripod ring have dried up by now.

Canon does still list the EF 300mm f/2.8 L IS on the list of lenses currently repaired by Canon Professional Services, but they may no longer fully support servicing the older version due to lack of parts availability. If you're a member of CPS it couldn't hurt to give them a call.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.