Reviews and Problems with Canon EF 180mm f/3.5L Macro USM
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Ring B Doesn't Fit EF 100 f2.8 L IS
20 October 2009
Excerpt: This tripod macro ring 'B' works well with the appropriate lenses but it does not fit the 100 mm f2.8 L IS lens, it's too big. The proper ring is the Tripod Macro Ring 'D'. Don't make the same mistake I did and believe the recommendations or you too will have an extra ring.
Excerpt: I love len's with rings. As an avid tripod user, it allows me to switch from vertical to horizontal images with a minimum of pain. When I receintly bought the Canon Macro Lens [...], I also ordered the ring [...]. The ring does not turn smoothly as the rings on my other Canon and Sigma lenes do. I think plastic is great when used properly. It does not fit this application as used. Advice from a retired product development engineer.