Normal primes for full frame cameras are often considered must-have items in any camera bag, since they usually offer stunning performance at a very moderate price.
On APS-C digital cameras, things look a bit different though. To achieve the field of view of a normal prime, it takes a lens in the range of 30mm to 35mm, preferably a fast one. Many systems feature a native 35mm f/1.4 lens, however these are usually full frame lenses targeting professional users. Which means: they are mighty expensive.
Nikon adresses this issue with its AF-S DX 35mm f/1.8 lens, however there is also a 3rd party option that is even faster: the Sigma AF 30mm f/1.4 DC HSM. The lens has been around for a while, in fact at the time of this review Sigma just announced they are going to replace the lens with a different design. So, the lens faces the end of its product life cycle.
However, that won't stop us from having a look at how the lens performs on our current DX test camera, the Nikon D7000.