The EF 100mm f/2.8 Macro USM — not the L version, the original — is the overlooked sibling of Canon’s more celebrated L-series macro. At used prices around $350, it delivers 1:1 macro reproduction with optical quality that the price differential does not adequately explain. Via the Canon EF-EOS R adapter on the R50, it becomes a 160mm equivalent macro lens with full electronic communication and a use case that extends well beyond close-up work.