Canon RF45mm F1.2 STM 45mm

The Canon RF 45mm f/1.2 STM gives you a 99th percentile aperture and 98th percentile bokeh for under $515 USD, which is genuinely impressive. But user sentiment sits in the 16th percentile, with owners reporting focus shift, softness wide open, and heavy vignetting. It's a bargain creative tool with real compromises.

The f/1.2 maximum aperture is the star of the show. Nine aperture blades and that 98th percentile bokeh ranking mean backgrounds melt away into creamy, expressive blur. The 45mm focal length on full-frame is a sweet spot for portraits and everyday shooting, and the portrait score of 88.3 out of 100 backs that up. Autofocus ranks in the 86th percentile, which is strong for an STM motor. It's quick and smooth, and you get full-time manual focus override if you need to fine-tune.

Optically, things get murkier. The optical quality score sits at 55th percentile, dead middle of the pack. The single aspherical element helps with spherical aberrations, but owners consistently report softness and contrast drop-off at f/1.2. Stop down to f/2.8 or beyond and the lens sharpens up nicely, but that focus shift issue between f/2 and f/2.8 means your focus point can drift as you change aperture. For a lens whose entire selling point is that f/1.2 aperture, having unpredictable image quality wide open is a real problem. The 345g weight and 67mm filter thread make it easy to carry around all day, which helps offset some of the optical quirks.

Stacked against the competition, this lens occupies a weird niche. The Sigma Contemporary 18-50mm f/2.8 DC DN is a zoom with more versatility but a full stop slower aperture. The Viltrox AF 13mm F1.4 XF is faster than most wide angles but serves a completely different purpose. The Tamron Di III VC 28-300mm f/4-7.1 and Nikon NIKKOR Z 17-28mm f/2.8 are zooms that trade aperture for range. None of them touch f/1.2. If you want that ultra-shallow depth of field on RF mount without spending L-series money, this is basically your only option. But the Panasonic Leica DG Vario-Elmarit H-ES12035 shows what you give up in versatility. This Canon is a one-trick pony, but the trick is really good when it works.

For the aperture you're getting, the price is wild. USD listings range from $429 to $515, a spread of $86 depending on where you shop. The cheapest US option comes in at $429, which is less than half what most f/1.2 primes cost. Canadian buyers see a similar spread, CAD 570 to CAD 652, so shop around before you commit. The budget score of 75.5 out of 100 reflects this. You're getting f/1.2 bokeh and low-light capability at a price point that normally buys you an f/1.8. The trade-off is the optical consistency and build quality. At 70th percentile for build, it's fine but not exceptional. No weather sealing, no lens hood included. You're paying for the aperture, not the whole package.

The Canon RF 45mm f/1.2 STM sits in the 99th percentile for aperture speed among all lenses in our database. That's the headline here. You're getting an f/1.2 full-frame prime for under $515 USD, which is frankly absurd when you look at what f/1.2 glass normally costs. The bokeh quality ranks in the 98th percentile too, so this thing isn't just fast on paper, it renders backgrounds beautifully.

But here's the catch. User sentiment lands in the 16th percentile, which is a massive red flag. Owners love the value and the sharpness when stopped down, but there are real complaints about focus shift between f/2 and f/2.8, softness wide open, and heavy vignetting before correction. This is a lens with a split personality. At its best, it's a bargain portrait and lifestyle lens. At its worst, it's unpredictable when you push it to f/1.2.

Skip this if you shoot professionally or need reliable wide-open performance. The 16th percentile user sentiment isn't just noise. Focus shift between f/2 and f/2.8 will drive you crazy if you're shooting paid work. The lack of image stabilization and weather sealing also rules it out for video shooters and outdoor work in rough conditions. And if you need versatility, the 34th percentile versatility score and 45.6 out of 100 landscape score mean this lens is a portrait specialist, not an all-rounder. Macro shooters should look elsewhere too, with a 32nd percentile macro ranking and only 0.13x maximum magnification.

The Canon RF 45mm f/1.2 STM is a frustrating lens. The specs are incredible for the price. f/1.2, 98th percentile bokeh, 345g, under $515 USD. But the 16th percentile user sentiment tells the real story. Owners who shoot stopped down love it. Owners who bought it for f/1.2 are disappointed by the softness and focus shift. If you're a hobbyist who wants to experiment with shallow depth of field and doesn't mind working around the quirks, this is a solid buy at $429. If you need consistent professional results wide open, save up for something better.