Tamron, Sigma, and more all make E mount lenses, often at significantly more affordable prices, so if you are looking for a specific focal length and aperture combination, do not forget to also check out other manufacturers' options. If you are wondering which lenses are right for your work, check out this great video that features an experienced photographer discussing his 10 favorite Sony lenses. No doubt, a lot of Sony's lenses are quite impressive, but one of the nice things about the E mount is that it also has one of the most robust third party libraries.