Canon EF 100mm F/2.8 Macro USM vs Canon EF 50mm F/1.4 USM — Which Is Better?

The Canon EF 100mm F/2.8 Macro USM and the Canon EF 50mm F/1.4 USM are both full-frame prime lenses for Canon EOS bodies with EF mounts. The 100mm arrived in 2000 as a macro specialist, while the 50mm dates from 1993 and serves as a fast standard prime. Either lens fits the same EOS bodies, so the mount will not limit your choice.

The 50mm is the lighter and shorter lens, at 290 g and 51 mm long against 600 g and 119 mm for the 100mm. The 100mm therefore needs more room in a camera bag.

A similarity in filter threads means one set of 58 mm filters fits both lenses directly, with no step rings between them. Both accept front filters, so a shared polariser or protective filter covers either lens you carry.

The 100mm is the clear choice for close-up work, offering life-size 1x maximum magnification and a closest focus of 31 cm against 0.15x at 45 cm for the 50mm. That lets you fill the frame with flowers, insects and product details without add-on accessories.

The 50mm answers with its wider f/1.4 maximum aperture against f/2.8 on the 100mm. That extra light helps handheld shooting in dim interiors and gives tighter depth control for portraits, while the 100mm doubles as a short telephoto at 100mm.

Neither lens offers weather sealing, image stabilisation, a fluorine coating or teleconverter compatibility. In practice that means neither is built for wet-weather shooting, and neither steadies the view handheld at slow shutter speeds, so both rely on your technique or light. Both provide autofocus with a manual focusing ring, and both diaphragms use eight blades with automatic control.

The 100mm uses a larger 12-element, 8-group optical design and supports internal focusing, so the barrel does not extend while you focus. That helps when working close to small subjects, where a protruding barrel could disturb or shadow them.

The 50mm's simpler 7-element, 6-group design includes two elements that help reduce chromatic aberration. Fewer elements and a shorter barrel are part of why it stays small and light.