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Today I decided to try my hand at some macro and used the profile of the serrated blade of a steak knife. It's quite remarkable to see the detail of the sharpness of the individual teeth of the blade.

Olympus E-5, Zuiko Digital 70-300mm f/4-5.6 zoom, @300mm, f/11, with 25mm extension tube, FL-50R flash, Lastolite EZYBOX mini softbox.