The Pentax SMCP-DA 300mm f/4 ED (IF) SDM* is a high-performance super telephoto prime lens designed for Pentax K-mount cameras. Below are the key features and specifications of this lens:

General Specifications

Type: Prime lens

Focal Length: 300mm (equivalent to 450mm in 35mm format)

Maximum Aperture: f/4

Minimum Aperture: f/32

Close Focus Distance: 1.4 meters (approximately 4.6 feet)

Maximum Magnification: 0.24x

Diaphragm Blades: 9

Lens Construction: 8 elements in 6 groups, including ED glass elements to minimize chromatic aberrations.

Physical Characteristics

Dimensions: Length of 184 mm (7.2 inches) and a diameter of 83 mm (3.3 inches)

Weight: Approximately 1,070 grams (38 oz) without hood; 1,160 grams (40.9 oz) with hood.

Filter Diameter: 77 mm

Features

Autofocus System: Utilizes Pentax's Supersonic Dynamic Motor (SDM) for fast and quiet autofocus operation. It also supports manual focus override through the Quick Shift Focus system.

Weather Sealing: The lens is designed with weather-resistant features, making it suitable for outdoor photography in various conditions.

Coatings: The front element has a Super Protect (SP) coating that repels dust, water, and grease, enhancing durability and ease of cleaning.

Tripod Mount: Includes a detachable tripod mount for stability during shooting, especially useful for long-duration photography or when using heavier camera setups.