Product Description

This compact, large and constant F2.8 aperture zoom lens and is ideal for digital SLR cameras. Two SLD elements and four aspherical lenses provide the ultimate correction against distortion as well as all types of aberration, especially spherical aberration. Its advanced optical design ensures high performance throughout the entire zoom range.The use of aspherical lenses in the construction of this lens not only corrects aberrations but also produces a very small and lightweight lens design. Its compact, yet robust, construction has an overall length of 87.2mm (3.4in.), maximum diameter of 74mm (2.9in.), filter size of diameter 67mm and weight of 510g(18.0 ounces).

Product Details

• Brand: Sigma
• Model: B00063KO70
• Dimensions: 5.00" h x 5.50" w x 5.50" l, 1.12 pounds

Features

• Zoom lens with Pentax AF mount
• Special low-dispersion glass for high image quality
• 28 to 70 mm focal length
• f2.8 maximum aperture
• Inner focusing system allows add-on hoods and filters

From the Manufacturer
World’s smallest, lightweight, yet robust, large aperture zoom lens

• EX DG Lens Series; Designed to give an excellent performance with Digital SLR Cameras as well as 35mm Film Cameras.
• Super Multi Layer (SML) coating reduces ghost and flare.
• Two pieces of Special Low Dispersion (SLD) elements and four aspherical lenses provide high quality images throughout the entire zoom range.
• Minimum focusing distance of 13 inches (33 centimeters) at all focal lengths.

This is the world’s smallest, large and constant aperture zoom lens and is ideal for digital SLR cameras. The power layout of the lens is specially optimized for digital SLR cameras, and Super Multi Coating gives superb color performance whilst cutting down flare and ghost.

Two SLD elements and four aspherical lenses provide the ultimate correction against distortion as well as all types of aberration, especially spherical aberration. Its advanced optical design ensures high performance throughout the entire zoom range.

The use of aspherical lenses in the construction of this lens not only corrects aberrations but also produces a very small and lightweight lens design. Its compact, yet robust, construction has an overall length of 87.2 millimeters (3.4 inches), maximum diameter of 74 millimeters (2.9 inches), filter size of 67 millimeters and weight of 510 grams (18 ounces). It has a minimum focusing distance of 33 centimeters (13 inches) at all focal lengths and a maximum magnification ratio of 1:4.4 which is very convenient for close-up photography.

The inner focus system allows the lens to be focused without rotating the front element, therefore a Petal-type hood and circular polarizing filters can easily be used.

Customer Reviews

I love this lens
This is my first Sigma lens, and won't be my last. I use mostly Pentax lenses on my Pentax K10D, but picked this up for the f/2.8. It's a beautiful lens and gives me lots of room to play with depth of field and natural light. The clarity of images, though, is what really makes this lens great. I look forward to trying some of their larger lenses.