The Pentax SMC DA 50-200mm f/4-5.6 ED WR Zoom Lens is a versatile telephoto zoom lens designed specifically for Pentax KAF-mount digital SLR cameras. Here’s a detailed product description:

Key Features

Focal Length Range: Covers focal lengths from 50mm to 200mm, equivalent to approximately 76.5mm to 307mm in 35mm format, making it suitable for moderate telephoto to super telephoto photography.

Aperture: Features a variable maximum aperture of f/4 to f/5.6, allowing for decent light capture while maintaining a lightweight design.

Optical Construction: Incorporates an extra-low dispersion (ED) glass element, which helps reduce chromatic aberration and enhances image clarity across the zoom range, making it ideal for portraiture, sports, and landscapes.

Weather Resistance: The lens is constructed with weather-resistant materials, ensuring durability and reliability in various environmental conditions.

Quick-Shift Focus System: This unique feature allows photographers to switch instantly from autofocus to manual focus after the camera has locked onto the subject, facilitating precise adjustments.

Compact and Lightweight Design: Weighing only about 370 grams (approximately 13 ounces), the lens is easy to handle and carry, making it a great choice for travel and outdoor photography.