Works great - I bought this to use with a Canon 17-40mm f/4L lens (at full frame) and it doesn't disappoint. Or get rid of all the vignetting at 17mm. I'm not exactly sure because I usually use a polarizer behind the big stopper to get rid of the blue cast from the big stopper. There is hardly any vignetting even with this setting. With no filter on the back, I'm pretty sure there's no vignetting at 17mm. If I remember correctly, with a 24mm lens on a full frame body, this accessory was not needed unless you mount round filters behind the Lee system.
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