Sigma 50mm F1.4 EX DG HSM
The Sigma 50mm 1.4 has smooth out-of-focus backgrounds, improved sharpness at large apertures, and lessened vignetting due to its large lens barrel. It's a far better portrait lens on APS-C than legacy primes designed for 35mm film, as well as an extremely competent standard on 35mm full-frame.
Those looking for a sharp, fast normal lens with quick autofocus and good build quality -- especially APS-C camera owners in search of the perfect portrait lens.
Anyone who wants their prime lenses to be small and lightweight.
Sigma 50mm f/1.4 EX DG HSM review
By: Jon Tarrant, What Digital Camera (Feb 1, 2010)
An amazing lens that is priced above the norm but delivers results that are similarly elevated. As it is available in a range of lens mounts, the greatest number of photographers have access to its immense power.
Review of Sigma 50mm f/1.4 EX DG HSM
By: SLR Gear
The Sigma 50mm /1.4 is an interesting lens, offering excellent resistance to chromatic aberration and low distortion. Corner shading isn't an issue when used on a sub-frame body, but on a full-frame body it's significant, and distinctive in that it never really goes away. The best you can get is a situation where the corners are a half-stop darker than the center, which I suppose isn't the end...