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Brainwave to solve the vignetting! Make a forward-mounting adapter using a lens bottom cap to accomodate the bayonet mount. I have a choice of caps to work with. From left to right: Kenko, Sigma, Canon, Canon. Yes, Canon apparently changed their cap design at some point to use a little less plastic. I choose the Kenko (from my new set of extension tubes!) because it is the lowest.