"Between them, third-party lens manufacturers offer a sizable array of optics, some of which compete squarely with models from major manufacturers while others fill a void of some kind within their ranges. By undercutting their bigger rivals in price while ensuring their products are competitively specified, these manufacturers’ lenses are an attractive option not only for budget-conscious novices, but enthusiasts and professionals, too. And, by occasionally trading away certain functionality for a significant proportion of the asking price, they’ve played a vital part in democratizing access to more exotic optics.
Here, we've examined ten of the most interesting third-party lenses on the market, arranged broadly by type, from wide-angle and standard zooms, through macro and prime lenses and ending with telephoto zooms. This article is not intended to be comprehensive, (we don't cover telephoto primes for example, or extreme telephoto zooms) and nor is it a review, per se. Where a lens has been tested by dpreview, we've included relevant observations and a link to the full review."