The Pentax Zoom Telephoto 60-250mm f/4 ED DA SDM Autofocus Lens* is a high-performance telephoto zoom lens designed for Pentax K-mount digital SLR cameras. Below are its key features and specifications:

Key Features

Focal Length: The lens has a focal length range of 60-250mm, which is equivalent to 92-383mm in the 35mm film format. This wide zoom range makes it versatile for various photography styles, including portraits, sports, and wildlife photography.

Constant Aperture: It maintains a constant maximum aperture of f/4 throughout the entire zoom range, allowing for consistent exposure settings and depth of field control.

Optical Design: The lens incorporates 15 elements in 13 groups, including two ED (extra-low dispersion) glass elements that help minimize chromatic aberration and enhance image sharpness.

Weather Sealing: Designed with a dust-resistant and drip-proof construction, it is suitable for outdoor use in challenging conditions. The front element features an SP (Super Protect) coating that repels water and oils, making it easier to clean.

Autofocus System: The lens utilizes a Supersonic Dynamic Motor (SDM) for fast and quiet autofocus operation. It also supports a hybrid AF mechanism that allows for manual focus adjustments without switching modes, known as the Quick Shift Focus System.

Build Quality: The construction is robust, combining metal and high-quality plastic components. It features a non-rotating front element, making it compatible with polarizing filters.