Last year Sigma made history when they released an 18-35mm zoom with a wicked-fast f/1.8 aperture. Up until then, the fastest wide-to-normal zoom you could get for your crop-sensor camera was something in the neighborhood of a 17-55mm f/2.8 (more than a full stop slower than the current offering from Sigma). In this video from The Camera Store TV, the new Sigma glass is tested against Nikon's fabulous f/1.8G wide-angle prime lineup.
Focus speed: Draw. Focus speed on both was always right around half a second.
Sharpness Wide Open: Slight edge goes to Sigma, especially in terms of corner sharpness.
OOF Elements: Some Nikons performed well, including the 28mm; but the Sigma produced consistently more pleasing out-of-focus elements.
Other considerations: The Sigma is a crop-sensor-only lens. This may or may not be a deterrent to you depending on what you shoot, what gear you have, and where you see yourself going photographically. The Nikon primes don't have this issue and are compatible with full-frame bodies.
So what do you think? If you use a crop sensor body, would you shell out for the Nikon Primes or opt for the Sigma 18-35?
[Via The Camera Store TV]