If you’re a photographer using a digital SLR (single lens reflex) camera, then you’ll certainly want to make sure you have a wide angle lens in your arsenal of photographic tools.

And if Canon is your chosen brand, then it’s a Canon wide angle lens that needs to be in your camera bag. Why, you ask? Because it’s generally accepted that the wide angle is the most indispensable of all your lenses.

In circumstances where a telephoto lens would make life easier but you don’t have one, you can usually change position and move closer to the subject to fill the frame. Or you could even crop the image in PhotoShop or other image editing software.

Unfortunately there is no comparable solution if you don’t possess a wide angle lens. If you’d like your landscape to include foreground flowers plus distant mountains, you’ll need to move back a long, long way to fit in the entire scene with a standard 50mm lens on your camera.

Similarly, when photographing interiors, space is usually limited, so you can’t move further back to fit in more of the scene. In such cases, a wide angle lens is the only option.

If you use a Canon digital SLR camera such as one of the Canon Digital Rebels (Canon EOS 400D, 450D, 500D) or a Canon 40D or 50D, then it’s important to understand that these cameras are fitted with APS-C sensors that are smaller than a full-frame sensor or 35mm negative.

This has the effect of magnifying the image and produces the same result as fitting 1.6x converter to the lens.

While this is a bonus for photographers using telephoto lenses, it works against wide angle lenses, effectively making them longer — so your 24mm wide angle on a Digital Rebel becomes a 38mm (24 x 1.6), i.e. close to a standard lens rather than a wide angle.

Fortunately Canon has produced a range of lenses, with the EF-S designation, to counter the crop factor of sub full-frame cameras with APS-C format sensors. Two of the top lenses offering wide angle capability within the range of EF-S lenses are:
* Canon EF-S 17-55mm f/2.8 IS USM
* Canon EF-S 10-22mm f/3.5-4.5 USM

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