A wide angle zoom lens with an f/2.8 maximum aperture is useful for a wide range of applications, including wedding photography, landscape work, astrophotography, and more. Such lenses can be quite expensive, however, often going for north of $2,000. Both Tamron and Sigma offer much more affordable options, however, and this excellent video comparison takes a look at both to help you decide which is right for your work.
[ Read More ](Originally posted by Alex Cooke)