Tamron 17-50mm f/2.8 SP AF XR Di-II LD IF
This is a so-called “normal” zoom, which means that it covers the zoom range you are most likely to use. If you are like most photographers, a “normal” zoom is the lens you will be using most of time, so you need to weight your options carefully.
This lens is very good value, costing only about half of the equivalent Nikon or Canon “normal” zoom. Sharpness is impressive, even at f/2.8. Flare is also well controlled. Some vignetting fully open, but otherwise excellent optical characteristics.
For Nikon, the newest version have a built-in-motor (gear type). Older versions in the F-mount depends on the focus motor in the body.
Rating: Ed: 80, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Nikon F, Pentax K, Sony A.
Aperture range: f/2.8 to f/32.
Optical zoom: 2.9x.
Close focus distance (CFD): 27 cm / 0.89 ft (from sensor plane).
CFD magnification: 1:4.5 / 0.22X.
Focus: AF (type depends on version).
Filter diameter: 67 mm.
L x D, W: 82 x 74 mm, 434 g.
IR: Poor IR performance.
Approximate street price: USD 460 (new, w/o tax).
Introduced: no data.
Tamron is a Japanese corporation specializing in the manufacture of photographic and industrial optics. The company was founded in 1950 as Taisei Kōgaku Kiki Seisakush. It was renamed Tamron in 1970.
As well as its own-branded designs, it makes many optical units for other companies compact digital cameras, and produces consumer grade lenses for several of the major DSLR manufacturers.