Sigma 100-300mm f/4 EX DG APO HSM
Very good value for money.
The Pentax and Sony versions comes without a built-in focus motor and do not have HSM as part of the long lens name.
Pentax version cannot be used with SF series AF cameras.
Rating: Ed: -, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Nikon F, Pentax K, Sigma SD, Sony A.
Aperture range: f/4 to f/32.
Optical zoom: 3x.
Close focus distance (CFD): 180 cm / 5.91 ft (from sensor plane).
CFD magnification: 1:5 / 0.2X.
Focus: AF (built-in, ring-type).
Filter diameter: 82 mm.
L x D, W: 224 x 93 mm, 1480 g.
Approximate street price: USD 1099 (new, w/o tax).
Sigma is a family owned manufacturer of photographic equipment founded in 1961 in Japan. The company's main business is to manufacture third party lenses. However they also produce third party flash units and, since 2002, their own line of DSLR and compact cameras. Sigma's digital cameras use a special sensor, developed by Foveon, that records full color information for every pixel. In late 2008 Sigma acquired Foveon.