The Canon EF 100mm f/2.8 Macro USM is an autofocus short-telephoto macro prime for the EF mount, offering 1:1 reproduction for close-up work. It was designed as a dual-purpose lens suited to macro subjects, portraits and general telephoto use on Canon EOS film and digital SLR bodies, with a ring-type ultrasonic motor for quiet, fast focusing.

At UK auction, hammer prices for this lens have sat in a tight £90–£130 band across the three recorded sales, with a median around £120 — wholesale saleroom levels that sit well below typical dealer retail. As of 2026, clean, fungus-free copies trade at the upper end of that range, and buyers should remember these figures are hammer prices before buyer's premium, so the all-in cost to win one at auction is higher than the headline value suggests.