Canon wide-angle prime lenses
Lenses with focal lengths below 50mm are known as wide-angles. The shorter the focal length, the wider the lens becomes and the bigger the field of view you’ll capture. So if you’re stood in the same position, a wide angle lens can literally squeeze in more, which is useful whether you’re trying to photograph a large building from inside or out, a sweeping landscape view, or even just a big group shot. They’re invaluable when you can’t step back any further.
By squeezing more into your photos, wide angle lenses inevitably have greater distortion, especially towards the edges. This may not be that noticeable on natural landscapes, but can appear unflattering on portrait shots unless the person (or people) are placed in the middle of the frame. That said, this effect can also produce pleasing results and be used to exaggerate perspective – a popular wide angle technique is to get very close to a foreground subject so it appears large compared to the background. Wide angle lenses also have large depths of field, which means it’s easier to get lots in sharp focus from close-up to far away.
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28mm is the most common wide angle focal length and can produce quite natural-looking results. Focal lengths below 20mm are generally known as ultra wide-angle and can produce quite extreme results. The most extreme of all come from fish-eye lenses which deliberately produce a highly curved result, while capturing an extremely large field of view.
As always, bear in mind any reduction in field due to your DSLRs sensor when choosing a lens. Canon’s APS-C models like the EOS 400D / XTi and 40D have a reduction factor of 1.6x. So if you’d like 28mm equivalent coverage, you’ll need to fit them with an 18mm lens.
Lenses with smaller f-numbers gather more light thanks to their bigger apertures, which makes them better in dim conditions and for minimising the depth-of-field. Bigger apertures however mean a larger, heavier and more expensive lens.
For a full explanation of lens specifications and examples of coverage at different focal lengths, check out our Camera Labs Lens Buyers Guide. | 
