Welcome to the Canon Store

Welcome to the Canon Store

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At Canon we have four different types of lens mount: RF, RF-S, EF, EF-S and EF-M. Put simply, a lens mount is the interface between a camera body and a lens. This feature allows for interchangeable lenses. Depending on your camera, different lens types can be used with or without a lens mount adapter.

We also have other specialist lenses including the TS-E (Tilt & Shift) and MP-E which have an EF mount. A TS-E lens allows the user to physically adjust the front of the lens, move it up and down, in order to adjust the apparent angle and plane of focus. This type of lens is mainly for specialist users and is ideal for a range of photography such as architecture, product and landscape photography.

Focal length

mm – Focal Length (eg. Canon EF 135mm f/2L USM Lens)

The focal length measures the range of a lens showing its shortest and longest distance. The bigger the number (the ‘longer’ the focal length), the narrower the angle of view. This means subjects will appear to be closer to the camera.














f/ or F – Aperture (eg. Canon RF 15-35mm F2.8L IS USM Lens)

Expressed as f-numbers or f-stop, aperture is the part of the lens where you control the amount of light that goes to the camera sensor. The smaller the number, the bigger the aperture and the more light can get to the camera. Controlling the aperture can benefit you in different ways. A wider aperture will create a very blurred background but a sharp subject or foreground. For example, F2.8 lets in more light than F11. Apertures of F2.8 and below are better suited for night photography and portraits.










Written in Roman numerals, this tells you where the lens sits in terms of development. When a lens design is improved, it gets a new number. (eg. III is the newer version of II)


Technologies offer more information in terms of features your lens has, and how it can help your photography.

Image Stabilisation

IS – Image Stabilisation (eg. Canon EF-M 55-200mm f/4.5-6.3 IS STM Lens)

Image Stabilisation is a system that reduces the effects of camera shake for a sharper image. You will know if your lens has image stabilisation because there will be an “IS” in the name.
Good to know: Image Stabilisation is measured in stops. The more stops a lens has, the more effective the IS will be.



Focusing Motor

USM – Ultrasonic Autofocus Motor (eg. Canon RF 15-35mm F2.8L IS USM Lens)


USM stands for Ultrasonic Autofocus Motor. This motor can be found in lots of our lenses. These lenses are fast and have a manual override, making them ideal for stills. Take a closer look at how USM works

Nano USM

Though it has “USM” in the name, Nano USM has benefits of both USM and STM. It offers fast, smooth and quiet focusing, making it ideal for action photography and videography. Take a closer look at how Nano USM works.

Why buy online from Canon?

Free Next Day Delivery* and Returns

Enjoy FREE next day delivery* on all orders of £ 30.00 and more made before 3pm, as well as free 30-day returns on all orders

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We give you the added reassurance of a 2-year manufacturer's guarantee (EWS) on our hardware products. Exceptions apply

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Extensive Product Range

Discover our full and extensive range of products in one place, including Canon site exclusives

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