I was looking at the EF Lenses brochure I just got from Canon and ran
across something I don't understand.
In the description of the EF 17-40mm f/4L USM it says "............ and
features the same weather-resistant design, rear gel filter holder, and
high speed USM as the EF 16-35mm lens."
Looking at my 17-40 I find a "rear gel filter holder". What am I missing?
Bob
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