Features:

• Optimized for use with digital SLR cameras
• Multi-layer lens coating and lens design reduces flare and ghosting
• Minimum focusing distance is 59 inches at all zoom settings
• Features 14 lens elements in 10 Groups
• High-performance lens ideal for portraits, sports photography, nature photography

Editor Reviews:

Product Description:
Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm focal length. It's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. It also has a switch for changeover to macro photography at focal lengths between 200mm and 300mm with a maximum close-up magnification from 1:2.9 to 1:2.SLD (Special Low Dispersion) glass in this lens provides excellent correction of chromatic aberration.

Amazon.com Product Description:
The Sigma 70-300mm f4-5.6 DG Macro Lens for Pentax Digital SLR Cameras is a telephoto lens that offers excellent cost performance and is optimized for use with digital SLR cameras. Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 millimeter focal length. It's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. The lens features a switch for changeover to macro photography at focal lengths between 200 millimeters and 300 millimeters, with a maximum close-up magnification from 1:2.9 to 1:2.

The multi-layer lens coating and lens design reduce flare and ghosting, which is a common problem with digital cameras, and it also creates an optimum color balance through the entire zoom range. The minimum focusing distance is 59 inches at all zoom settings. The lens features a switch for changeover to macro photography at focal lengths between 200 millimeters and 300 millimeters with a maximum close-up magnification. Without changing the distance between camera and subject, you can change the shooting magnification.

Rating : - Great Lens to start out with! Amazing result to end with!
Recently got it in the mail and once I start using it, it seems to very sturdy, and it can stand up to harsh condition. This lens is great for macro because of the built in macro switch. Very easy to use. Portrait turned out amazing with this too. Overall, great deal and great lens, and Sigma lens are well made.