Product Description

To maintain high optical performance from infinity to close-up 1: 1 (life-size) macro photos without accessories, the new Sigma 50mm f2.8 EX incorporates a "floating" element focusing system.Designed as a quick-focusing macro lens the AF speed of 50mm, f2.8 EX Macro is 1.4 times faster than previous 50mm f2.8 macros. It features a non-rotating front lens group which makes it easier to work with polarizing filters and has a focus limiter (eg. Full Range; - 9.8 in.; 9.1 in. - 7.4 in.). The Sigma 50mm f/2.8 EX Macro lens also features the new deluxe EX external finish.A handy screw type metal sunshade makes it easier to rotate a polarizing filter.

Product Details

• Size: Pentax
• Brand: Sigma
• Model: 50/2,8 EX Macro Pentax AF

Features

• Dedicated to Pentax AF SLR cameras
• "Floating" element focusing system
• 1.4 times faster than its predecessor
• Nonrotating front lens group for easy use of polarizing filters
• High quality optical performance from infinity to the close-up 1:1 (life-size) macro

Amazon.com Product Description
Sigma's "floating" element focusing system gives the 50mm f2.8 EX macro lens a high-quality optical performance from infinity to the close-up 1:1 (life-size) macro, all without accessories. This lens was designed as a quick-focusing macro, and at f2.8 it is 1.4 times faster than its predecessor. It features a nonrotating front lens group that makes it easier to work with polarizing filters. This model is dedicated to Pentax AF SLR cameras.