Tamron 28-75mm f/2.8 XR Di LD
This lens seems to be designed to offer super sharpness in the centre, at the expense of the corners where sharpness is well below average, even when stopped down to f/8.
Flare and chromatic aberration is well controlled. Vignetting is pretty bad wide open, but well controlled from f/4. Colours are on the warm side. It produces distinct, but easy to correct barrel distortion at 28 mm, changing to very slight pincushion distortion at 75 mm. At 40 mm, images are distortion free.
Auto-focus is slow and noisy. Otherwise, it gives a solid feeling. The zoom and focus rings have decent sizes and are well damped. As is the norm with modern zooms, there are no depth of field scales and no IR focus identification mark. The zoom can be locked in the 28 mm position to prevent creep when not in use.
Overall, this is a quite attractive lens for DX/APS-C. For FX/FF, the corner performance makes it a less attractive choice.
Comes with a petal style detachable lenshood.
Rating: Ed: -, 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: 2.7x.
Close focus distance (CFD): 33 cm / 1.08 ft (from sensor plane).
CFD magnification: 1:3.9 / 0.26X.
Focus: AF (built-in, gear-type).
Filter diameter: 67 mm.
L x D, W: 92 x 73 mm, 510 g.
IR: Poor IR performance.
Approximate street price: USD 459 (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.