The Sigma 50–150mm f/2.8 for Canon APS-C — A Forgotten Gem That Still Makes Sense in the Mirrorless Era
Some lenses age poorly. Others become oddly relevant years later. The Sigma 50–150mm f/2.8 for Canon APS-C cameras belongs firmly in the second category. It was designed during the DSLR era, yet its concept fits almost perfectly with today’s mirrorless APS-C systems.
The key version worth talking about is the non-stabilized Sigma 50–150mm f/2.8 EX DC HSM. This lens weighed roughly 770 grams, which immediately tells you what Sigma was trying to achieve: a professional constant-aperture telephoto built specifically for crop sensors, but without the bulk of a traditional 70–200mm f/2.8. On a Canon APS-C camera the focal range translates to roughly 80–240mm equivalent, placing it squarely in portrait, indoor sports, stage photography, and compressed travel territory.
The size and weight were the whole point. A typical 70–200mm f/2.8 for full frame often lands somewhere around 1.4–1.5 kg. By comparison the original 50–150mm felt compact, balanced, and surprisingly practical for hand-held shooting. It was essentially a crop-sensor version of the classic pro telephoto zoom, scaled correctly for the sensor it was meant to serve.
Today, these lenses appear regularly on the used market at roughly $350, sometimes a little more depending on condition. At that price the lens becomes a very interesting option for modern Canon mirrorless APS-C cameras like the R7, R10, or R100 when used with the EF-to-RF adapter. Autofocus works, aperture control works, and you effectively get a fast telephoto zoom that Canon itself still does not offer in RF-S form.
Sigma later released a stabilized OS version, but this is where the concept arguably started to fall apart. That version weighs about 1.3 kg, almost doubling the weight of the original design. Once a lens reaches that size and weight, the whole APS-C optimization argument begins to collapse. At that point you might as well use a full-frame 70–200mm lens, which delivers broader compatibility and often better optical performance for a similar mass.
That’s why the earlier non-stabilized version remains the interesting one. It represents a design philosophy that the industry has strangely abandoned: building fast professional zooms specifically for APS-C systems instead of forcing crop cameras to rely on full-frame lenses.
Ironically, the idea makes even more sense today. Many photographers now run lightweight two-body setups—something like a full-frame camera paired with a compact APS-C body to extend reach and avoid constant lens changes. In that kind of kit, a 770-gram f/2.8 telephoto designed for crop sensors suddenly feels like a very smart piece of engineering.
The Sigma 50–150mm f/2.8 may be discontinued, but conceptually it still fills a hole in Canon’s lineup. And until someone releases a modern RF-S 50–150mm f/2.8—or perhaps a 50–135mm f/2.8—the old Sigma remains one of those curious lenses that refuses to become obsolete.