Sigma 50mm f/1.4 EX DG HSM Lens for Canon EF-Mount {77}

Sigma's 50mm f/1.4 EX DG HSM: the fast fifty that rewrote expectations.

When Sigma released this 50mm in 2008, it forced a serious conversation about what a third-party lens could actually deliver. The f/1.4 maximum aperture is the headline spec, but the 9-blade rounded diaphragm is the reason portrait shooters keep coming back, out-of-focus backgrounds render with a smooth, circular quality that rounder blades consistently produce better than straight-edged alternatives. a 8-element, 6-group design incorporating one aspherical element controls field curvature and spherical aberration at wide apertures, where budget glass typically falls apart.

The HSM ring-type ultrasonic motor drives focus quickly and quietly, and full-time manual override means you can fine-tune without switching modes. Internal focusing keeps the barrel at a fixed 68mm length, so the 77mm filter thread never rotates during focus, a practical advantage when you're running a polarizer or graduated ND. Minimum focus distance sits at 0.45m, giving you enough working room for environmental portraits and table-top detail shots.

At 505g, this lens has real weight behind it, which Canon shooters mounting it to a full-frame body will feel, but that mass comes from a metal mount mated to a solid barrel, not filler. For anyone shooting Canon EF on a budget that can't stretch to the first-party 50mm L glass, this Sigma has spent 17 years proving the point.

Who It's For

Portrait photographers working in available light will get immediate use from the f/1.4 aperture and the 9-blade rounded diaphragm, which together produce the subject separation that defines the look. Street and documentary shooters benefit from the HSM motor's quiet, fast acquisition and the fixed barrel length that doesn't telegraph the shot with a moving focus element. Travel photographers covering full-frame Canon bodies get a compact 68mm prime that won't dominate a bag. Studio and product photographers will appreciate the non-rotating 77mm filter thread for consistent filter positioning across a shoot.

Key Features

• 50mm fixed focal length with f/1.4 maximum aperture
• 9 rounded diaphragm blades for smooth bokeh
• Internal focus with non-rotating 77mm filter thread
• HSM ring-type ultrasonic motor with full-time manual override
• 8 elements, 6 groups with 1 aspherical element
• 0.45m minimum focus distance for environmental portraits
• Metal mount with plastic barrel construction, 505g weight

FAQ

Why does this 50mm's bokeh look different from cheaper alternatives?

The 9 rounded diaphragm blades render out-of-focus areas with a smooth, circular quality that straight-edged blades can't match - this is physics, not marketing. Wide apertures are where you see the difference most clearly.

Can you use an ND filter on this lens without it rotating during focus?

Yes. Internal focus keeps the 77mm filter thread stationary, so polarizers and graduated NDs stay locked in position - critical when you're trying to hold a specific filter angle.

How close can you focus with this Sigma 50mm?

Minimum focus distance is 0.45m (17.72 inches), giving you enough working distance for environmental portraits and close-up detail work without requiring an extension tube.

Is autofocus fast and quiet on this lens?

The HSM ring-type ultrasonic motor is quick and silent - useful on set or in quiet environments. Full-time manual override means you can fine-tune focus without switching modes.

What's the weight difference between this and Canon's 50mm L glass?

This Sigma weighs 505g. Canon's EF 50mm f/1.4 USM runs about 290g, so you're looking at a 215g difference - noticeable on a full-frame body, but the trade-off is cost.

Does the barrel extend when you focus?

No. Internal focusing keeps the barrel fixed at 68mm length, so it won't snag on bag zippers or extend into your filter system during shooting.

How many elements control aberrations at f/1.4?

Eight elements across six groups, including one aspherical element that handles field curvature and spherical aberration - this is why the lens doesn't fall apart at maximum aperture like budget alternatives do.