Canon 50mm f/1.8 EF-Mount Lens {52} Metal Mount

Canon's proven nifty fifty, now with STM autofocus.

The Canon EF 50mm f/1.8 STM is one of the most straightforward lenses Canon makes, and that's exactly the point. At 159g and just 39mm long, it disappears in a bag and barely registers on a camera body. The f/1.8 maximum aperture gives you real low-light reach without the weight or cost of the f/1.4, and the 7-blade circular diaphragm produces smooth, rounded out-of-focus areas at wide apertures.

The STM stepper motor is the defining upgrade over the older DC motor design. Autofocus runs quiet and smooth, which matters in video where motor noise bleeds into on-camera audio. Internal focus keeps the front element stationary during focusing, so polarizers and graduated ND filters stay put. Full-time manual focus override means you can fine-tune focus without switching modes. Minimum focus distance sits at 0.35m, with a maximum magnification of 0.21x, enough to fill the frame with small subjects at close range.

On EF-mount bodies this lens just works, natively and without compromise. Canon RF users can add it via Canon's EF-RF adapter with full electronic communication intact. At 49mm filter thread, filters are affordable and plentiful. Few lenses at this focal length offer this combination of optical quality and practical simplicity at anywhere near this price point in the used market.

Who It's For

Portrait photographers shooting on a budget get a genuine f/1.8 separation tool that performs on full-frame and APS-C bodies alike. Video shooters benefit directly from the STM motor's quiet operation, since DC motor lenses create audible noise that ruins location audio. Students and photographers building their first prime kit get a 50mm that teaches the focal length without financial risk. Street photographers who want a small, light lens that won't attract attention will find the compact 39mm profile and 159g weight genuinely useful day to day.

Key Features

• 50mm prime with f/1.8 maximum aperture
• Stepper motor (STM) autofocus for quiet, smooth operation
• Internal focus keeps front element stationary during AF
• Full-time manual focus override without mode switching
• 7-blade circular diaphragm for smooth out-of-focus rendering
• 0.35m minimum focus distance with 0.21× magnification
• 159g weight and 39mm length for compact carry
• 49mm filter thread with native EF mount compatibility

FAQ

What autofocus motor does this lens use?

The STM (Stepper Motor) is Canon's quieter, smoother AF design for video work. It's notably quieter than the older DC motor found in the non-STM version, so on-camera audio stays cleaner during recording.

Does autofocus work on Canon RF bodies?

Yes. Canon RF users can mount this EF lens via Canon's EF-RF adapter with full electronic communication intact, including autofocus.

What's the minimum focus distance?

0.35 m (13.78?) with a maximum magnification of 0.21×. Close enough to frame small subjects, though not a macro lens.

Does the front element rotate during focus?

No. Internal focus keeps the front element stationary, so a polarizer or graduated ND filter won't shift as you focus.

Can you manually focus without switching modes?

Yes. Full-time manual focus override means you can fine-tune focus at any moment, whether the camera is in AF or MF mode.

What's the filter thread size?

49mm. Filters are cheap and widely available at that size.

Is this lens weather-sealed?

No. It has no weather sealing, so avoid prolonged exposure to rain or dust.