Choosing lenses

Key factors to watch out for

The main factors to consider in a lens are its focal length, maximum aperture, and whether or not it’s full-frame compatible. We’ve categorized lenses by focal length range – from wide-angle to telephoto. The larger a lens’s maximum aperture, the ‘faster’ it’s considered to be – allowing you to control depth of field more, and offering better options in low light. Zooms are more flexible than primes, but tend not to have such fast maximum apertures. Full-frame lenses will also work with ‘crop-sensor’ EOS DSLRS, but crop-sensor lenses aren’t compatible with full-frame cameras.