Sigma and Tokina both announced some new DX sensor lenses, and they're mostly very unique in some way:
- Tokina 35mm AT-X M35 Pro DX. Hmm, a true macro lens at 35mm. Essentially, this is supposed to the equivalent of the 60mm Micro-Nikkor, but for the DX sensor cameras. Okay, but is that really necessary? The problem with really short macro lenses is that at 1:1 they have very little working distance to the subject. The 60mm Micro-Nikkor and all its predecessors were mostly designed for copy stand work, where you weren't dealing with moving or skittish subjects, and where you could control the lighting with close approach. It's nice to have this new alternative, but it's not a mainstream lens, IMHO.
- Tokina 11-16mm f/2.8 AT-X 116 Pro DX. The folk that complained about the Nikkor 12-24mm being an f/4 lens will probably get excited about this lens, as it finally gives DX users a truly fast wide angle zoom. The 11-16mm (17-25mm equivalent) focal range is a little short, but it mates up close enough to the many 17-xx zooms to give most DX users a fast 11 to 200 in three lenses (11-16mm, 17-55mm, 70-200mm).
- Sigma 4.5mm EX DC Circular Fisheye. Another gap filled: the truly circular fisheye for DX sensors. This lens gives you a circular image within the DX frame that covers 180 degrees across all directions. If you need it, you need it, and now you can get it.
- Sigma 10mm f/2.8 EX DC Fisheye HSM. Essentially the same thing as the Nikkor 10.5mm: a "fisheye" lens that covers the whole DX frame. The 180 degrees that make it "a fisheye" are measured across the diagonal of the frame. This is the only one of the new lenses which duplicates an existing lens (actually two: the Tokina 10-17mm also produces a 180 degree diagonal at 10mm).