Sigma: Two new lenses
By
Mike Tomkins
(Wednesday, November 23, 2005 - 13:06 EST)
Press releases over the last week or so from the headquarters of optics company Sigma Corporation in Japan have announced two new lens releases.
First, the company has announced a Konica Minolta mount version of its 18-200mm F3.5-6.3 DC lens, which was first announced back at the PMA show last spring, and has been shipping in Canon, Nikon, Pentax and Sigma mounts for a while now.
Secondly, Sigma unveiled a new lens design - the Sigma APO 135-400mm F4.5-5.6 DG. Featuring one aspherical and three SLD (Special Low Dispersion) lenses, the new lens is 7.2" (183.6mm) long, has a diameter of 3.3" (83.5mm), and weighs 43.9oz (1.25kg). Construction is 13 elements in 11 groups, with a nine-bladed diaphragm, and a minimum aperture of F32. Angle of view ranges from 18.2° to 6.2°, with a maximum magnification of 1:5.3. Minimum focusing distance ranges from 78.7 - 86.6" (200 - 220cm). The lens accepts a filter size of 77mm, and has a bayonet-type hood.
Pricing and availability weren't disclosed in the press releases.
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