Originally posted by Ducatigaz What are SMUs?
Already answered by Racer X 69 and others, but FYI: it goes back to someone on this thread who wanted to indicate the size of a lens he'd purchased, so he put of stack of Girl Scout thin mint cookies next to it. Others took it up, and it became the "SMU" = standard measuring unit for showing the size of newly obtained lenses in particular. For some long telephotos it is necessary to put a dab of aerosol decorative cookie/cake decorating frosting between the thin mints to keep the stack upright. If you cannot get - have never tasted a Girl Scout thin mint, my deepest sympathy. They are a really nice cookie, although a new flavor introduced this year, the "smores" cream-filled, is also very good and has the potential, IMHO, to become an annual in-demand classic.