The larger the maximum aperture, the easier it is to obtain a creamy background blur (background bokeh) effect that makes your subject stand out.

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- Beautiful shallow focus (background bokeh) effects. - You can use a faster shutter speed in low light. - Better autofocusing performance in low light. - When shooting at or near the maximum aperture, you’ll need to make extra effort to ensure everything is in focus because of the smaller depth of field.

For portraits and product photography, you’ll often want more background bokeh to make the subject stand out better.  Use a longer focal length for more intense blurring. (See: Lens Basics #3: Creating Bokeh). For most purposes, an ultra-wide-angle lens isn’t ideal because of the perspective distortion, though they can be used for creative reasons.

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A lens’ maximum aperture affects the size of the bokeh circles you can create when there are tiny point light sources or reflected light behind your main subject. A smaller f-number (wider aperture setting) gives you larger bokeh circles.

With their versatility and focal range, standard zoom and superzoom lenses are very popular lenses especially for beginners. Let’s find out more about their special features. (Reported by: Tomoko Suzuki)

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“Aperture” here refers to the aperture diaphragm: the opening in the lens that allows light to enter.  “Large aperture lenses” are lenses that have a wide/large maximum aperture. In other words, the f-number in the lens name is small: f/2.8 or lower.

However, at small f-stop settings, it can be more difficult to establish precise focus because of the shallow depth of field. You might need to magnify the display to see better and/or use manual focusing. (Also see: Focus Guide & MF Peaking: Making Manual Focus Easier)

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Wide-angle lenses intrinsically have a larger depth of field, so the background won’t be as blurred compared to a longer lens at the same aperture. If you want a beautiful blurred background while shooting wider, choose the largest aperture lens possible.

From left: - RF24-105mm f/2.8L IS USM Z - RF24-70mm f/2.8L IS USM - RF28-70mm f/2L USM - RF15-35mm f/2.8L IS USM - RF70-200mm f/2.8L IS USM

The “holy trinity of lenses” refers to a set of three fast, professional-grade wide-angle, standard, and telephoto zoom lenses. If you want maximum versatility with fewer lenses, aim to own them. You can do a lot with their wide maximum apertures and combined focal range.

Large aperture lenses refer to lenses with a low maximum f-number, such as f/1.2 or f/1.8. They are good for shooting in low light, and make it possible to achieve a creamy background blur (bokeh) effect. Read on to learn more about them—we also shared some recommendations!

Large aperture lenses are “bright” because a wider aperture allows more light to pass through the lens. At the same shutter speed and ISO speed settings, a wider aperture setting (smaller f-stop setting) results in a brighter image.

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As you can see, large aperture lenses expand possibilities in many different situations. That’s why many photographers and filmmakers would pick them over other options! They are good to have regardless of what you shoot, but these genres will reap more benefits:

Depth of Field (DOF) determines the closest and farthest objects in an image, both of which are in focus. The entire image between these objects also maintains ...

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The traditional holy trinity consists of the 15-35mm (wide-angle), 24-70mm (standard), and 70-200mm (telephoto). However, Canon has two more fast standard zoom lens options: the RF28-70mm f/2L USM and RF24-105mm f/2.8L IS USM Z. Choose the one that best fits your needs!

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Telephoto lenses let you fill the frame with a subject and create a creamy background blur, all with little distortion. Read on to learn more about them. (Reported by Tomoko Suzuki)

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Also see: Lens FAQ #2: Can A Fast Lens Really Make It Easier To See Through The Viewfinder? Camera FAQ: How Does the Low-Light AF Limit Impact My Shots?

A longer focal length blurs out the background more, so for the best possible bokeh, try a medium telephoto lens like the RF85mm f/1.2L USM and RF135mm f/1.8L IS USM especially when you have more space to work in.

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You’ve probably heard people describing a lens as “bright” or “fast”. These are other names for large aperture lenses. The reason why goes back to the concept of exposure and the exposure triangle.

Sometimes, a zoom lens is more convenient. These are some of Canon’s most popular large aperture zoom lenses. Unlike most kit lenses, they are all constant aperture zoom lenses so the maximum aperture stays at f/2.8 even when you zoom in.

From left: - RF16mm f/2.8 STM (makes a good fast 25.5mm equivalent lens on an APS-C camera) - RF28mm f/2.8 STM  - RF24mm f/1.8 Macro IS STM - RF35mm f/1.8 Macro IS STM - RF35mm f/1.4L VCM - RF50mm f/1.8 STM (“Nifty Fifty”)

Large aperture lenses are also “fast” because with more light entering the lens (and reaching the image sensor), you can achieve the same image brightness with a faster shutter speed. This makes it easier to freeze fast-moving action in dim lighting conditions. It also prevents camera shake during handheld shooting, especially when using a telephoto lens where blurring becomes more prominent.

The lenses with the red ring are professional-grade lenses: they have a dust- and moisture-resistant design and better optical quality.

These compact, lightweight prime lenses in classic street photography focal lengths will help you freeze unexpected moments even when shooting at night! The ones with “Macro” in the name are also good for close-up shots.

A large aperture lens lets us achieve the same exposure with a faster shutter speed, making it possible to freeze the moving boat and achieve a sharp image.

Aperture-priority AE (Av) mode is a semi-automatic exposure mode. You have the freedom to choose the f-stop; the camera selects the best shutter speed and ISO speed settings so that the scene is correctly exposed.

Make your main subject stand out better in a busy scene by using a large aperture lens to blur out other objects in the background and foreground.  You might find yourself using this technique very often when photographing food, objects around you, or even portraits!

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The lenses with the largest maximum apertures tend to be prime lenses simply because they are easier to design. Here are the focal lengths we recommend for each of the genres. Remember to factor in the 1.6x crop factor if you are using an APS-C camera like the EOS R10 or EOS R50!

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Here’s another strength of large aperture lenses that many people don’t know: they help autofocus performance in low light, at least on Canon cameras! That’s because the camera usually looks for focusing subjects at the maximum aperture (full-aperture metering). More light reaching the sensor means more useful information for the Dual Pixel CMOS AF system.