Canon R10 Background Blur: Aperture, Distance and Lenses

To blur the background on the Canon EOS R10, set the widest aperture your lens allows, because a wider opening gives shallower depth of field and stronger, more subject-isolating background blur. The kit zooms are slow lenses, so the easiest upgrade is an affordable fast prime such as the RF 50mm F1.8 STM.

What controls background blur on the R10

Three things decide how soft the background looks: the aperture you choose, the focal length you shoot at, and how you position yourself, your subject and the background. Your camera body matters less than you might expect. The lens does most of the work.

Aperture

The aperture is the opening inside the lens. A smaller f-number, such as f/1.8, means a wider opening than a larger one, such as f/6.3.

A wider aperture produces a shallower depth of field, which gives stronger background blur at the same focal length. A wide aperture also lets more light reach the sensor, which helps you stop motion and focus in dim light, such as indoors.

The out-of-focus look itself is often called bokeh. In The-Digital-Picture's review of the RF 50mm F1.8 STM, the reviewer notes that the amount of blur a lens produces is easy to show, while its quality is harder to judge because every scene is different.

Focal length and distance

The-Digital-Picture explains the chain clearly: focal length determines angle of view, angle of view determines how far you stand from your subject for the framing you want, and that distance determines perspective. So choosing a lens also chooses where you stand.

Distance is the free tool. Try a simple test: photograph a friend standing right against a wall, then ask them to walk several steps away from it and shoot the same framing again. Compare the two backgrounds on your screen. Then try it once more while you step in closer. You will learn more about your lens from those three frames than from any chart.

The APS-C crop factor

The EOS R10 uses an APS-C sensor with a 1.6x crop factor. When you mount a full-frame RF lens, its field of view narrows by that 1.6x factor.

Canon's own notes show the effect: the RF-S 18-45mm at 45mm is a 35mm film equivalent of 72mm on the R10. Ken Rockwell puts it in telephoto terms: a 70-200mm f/2.8 on the R10 makes the same pictures as a 115-325mm f/2.8 would on a full-frame camera.

For portraits, the practical upshot is that a 50mm lens frames like a short telephoto on the R10, so you stand farther back than you would on full frame for the same head-and-shoulders shot. The guide to Canon APS-C vs full frame cameras covers how sensor size fits into the rest of the lineup.

Why the kit lens makes blur hard

At launch, Canon offered two native RF-S lenses for the R10 and R7: the RF-S 18-45mm f/4.5-6.3 IS STM and the RF-S 18-150mm f/3.5-6.3 IS STM. Photography Blog's main complaint was exactly this, calling them two slow zoom lenses, though very affordable.

The "f/4.5-6.3" in the 18-45mm's name tells you its widest aperture changes as you zoom, and neither end is wide by prime-lens standards. That does not mean you get no blur at all. It means you have to lean on distance and focal length harder.

Getting the most from the RF-S 18-45mm

Canon lists a minimum shooting distance of 0.20 m at 18mm and a maximum magnification of 0.16x at 45mm. The lens also weighs about 130 g and has 4.0 stops of image stabilization on the R10 at 45mm, based on CIPA standards.

For the most blur from this lens, zoom all the way to 45mm, set the widest aperture it allows there, fill the frame with a small subject like a flower or a coffee cup, and keep the background far behind it. Close-up subjects with a distant background are where a slow zoom does best.

Lenses that make background blur easy

The R10 uses the same RF mount as Canon's full-frame cameras, so full-frame RF lenses work natively, and EF and EF-S lenses work through the Mount Adapter EF-EOS R. The RF mount keeps the large 54mm inner diameter of the EF mount, which The-Digital-Picture credits with ultra-wide aperture support.

Lens	Widest aperture	Framing on the R10 (1.6x)	Notes from the evidence
RF-S 18-45mm f/4.5-6.3 IS STM	f/4.5 to f/6.3	About 29-72mm equivalent	Kit zoom, about 130 g, 4.0 stops IS
RF-S 18-150mm f/3.5-6.3 IS STM	f/3.5 to f/6.3	About 29-240mm equivalent	Second launch RF-S zoom
RF 16mm f/2.8 STM	f/2.8	About 26mm equivalent	Suggested by Digital Camera World as a lightweight pairing
RF 50mm F1.8 STM	f/1.8	About 80mm equivalent	Compact, light, low price; 0.25x maximum magnification
RF 45mm F1.2 STM	f/1.2	About 72mm equivalent	About 1.2 stops wider than the 50mm F1.8
RF 85mm f/2 Macro IS STM	f/2	About 136mm equivalent	Named by TechRadar as an affordable full-frame option
RF 24-70mm F2.8 L IS USM	f/2.8	About 38-112mm equivalent	Professional-grade, not compact

Equivalent focal lengths in the table are the lens focal length multiplied by the R10's 1.6x crop factor and rounded.

RF 50mm F1.8 STM: the easy first upgrade

A prime lens often has a much wider aperture than a zoom, and the RF 50mm F1.8 STM pairs that f/1.8 opening with a compact size, light weight and low price. Digital Camera World called it a $200 wonder and said its image quality is on par in some areas with the RF 50mm f/1.2L, which costs over ten times as much.

TechRadar described the R10 combined with the RF 50mm f/1.8 STM as a neat, lightweight little bundle. The-Digital-Picture points out that the RF version has a slightly higher maximum magnification than the older EF 50mm f/1.8 STM (0.25x vs. 0.21x) and advises getting the RF lens if you have an RF mount camera.

On the R10, this lens frames like a short telephoto, which suits portraits of one person from the waist or chest up. Among 50mm primes, though, f/1.8 is a somewhat narrow aperture, with f/1.4 common and the RF 50mm f/1.2 L USM opening wider still.

RF 45mm F1.2 STM: more blur for more money

The-Digital-Picture calls the RF 45mm F1.2 STM a great step-up option, with 90% of the 50mm's focal length and an aperture about 1.2 stops wider. If you already like the 50mm look and want softer backgrounds at the same framing, this is the logical next step.

RF 85mm f/2 Macro IS STM: tighter portraits

TechRadar names the RF 85mm f/2 Macro IS STM as one of the affordable full-frame options available to R10 owners. On the R10 it frames much tighter than the 50mm, so you need more room to back up, but the longer focal length changes how much of the background ends up behind your subject.

Professional zooms and adapted lenses

The-Digital-Picture's suggestions for a professional-grade standard zoom on the R10 are the RF 15-35mm F2.8 L IS USM, RF 24-70mm F2.8 L IS USM and RF 24-105mm F4 L IS USM, with the caveat that none is especially compact like the R10. An f/2.8 zoom gives you more blur than the kit lens across the whole range.

You can also adapt Canon's EF lenses. Photography Blog notes that this can negate the point of buying a smaller, lighter and cheaper camera, so weigh the size of the combination before you commit.

Focusing and settings when depth of field is thin

Shallow depth of field makes focus placement unforgiving: at f/1.8, a portrait focused on the ear instead of the eye looks wrong. The R10 gives you good tools for this.

Place focus precisely

The R10 brings back Canon's Touch and Drag AF, which lets you move the focus point with your thumb on the touchscreen while looking through the viewfinder. It also has an AF joystick, which TechRadar notes is often left off beginner cameras.

The R10's subject detection comes from the EOS R3 and can detect and follow humans, animals (dogs, cats and birds) and vehicles. Canon cautions that animal and vehicle detection may not work properly with some subjects. The-Digital-Picture found the R10's AF accuracy especially excellent, focusing precisely shot after shot.

For portraits, let subject detection find the person, confirm the focus box sits on the eye nearest you, and use the joystick or touchscreen if it picks the wrong spot.

Exposure and shake

Use a shooting mode where you set the aperture yourself, so the camera cannot quietly stop the lens down. In bright sun, a wide aperture lets in a lot of light, so watch that your shutter speed and ISO keep the image from overexposing.

Digital Camera World lists the lack of in-body image stabilization as one of the R10's few drawbacks. The RF 50mm F1.8 STM has no image stabilization either, though The-Digital-Picture notes its wide aperture means it has less need for it. Keep your shutter speed fast enough for a steady handheld shot, especially with longer lenses.

Background Clarity after the shot

The R10 supports Dual Pixel RAW, which Photography Blog says allows correction of the focus and contrast in the background through the Background Clarity mode after capture, using the touchscreen. Treat it as a finishing adjustment, not a replacement for a wide aperture and good distance.

Background blur in video

The same rules apply to video. TechRadar notes that the R10's 4K/60p mode comes with a 1.56x crop. That crop narrows your framing further, so in 4K/60p you may need to step back or use a wider lens to keep the same composition, which changes your distance to the subject.

A quick routine to try

1. Set the widest aperture your lens offers.
2. If you are on the kit zoom, zoom to 45mm.
3. Move your subject well away from the background.
4. Step in until your subject fills most of the frame.
5. Put the focus point on the nearest eye with the joystick or touchscreen.
6. Shoot, then compare against a frame taken with the subject near the background.

If those steps still leave you wanting more blur, the lens is the limit, and a fast prime is the cheapest fix. For a broader look at bodies, lenses and accessories in the system, see The Canon RF Camera Ecosystem explained.