The Pentax SMC DA 50-135mm f/2.8 ED (IF) SDM is a telephoto zoom lens designed for APS-C digital SLR cameras, offering a focal length equivalent to 76.5-207mm in 35mm format. This lens is part of the Star series, recognized for its high-quality optical performance and durability.

Key Features

Maximum Aperture: The lens maintains a constant maximum aperture of f/2.8 throughout its zoom range, enabling excellent low-light performance and depth of field control.

Optical Construction: It consists of 18 elements in 14 groups, including three extra-low dispersion (ED) glass elements to minimize chromatic aberration and enhance color fidelity.

Weather Sealing: The lens features a dust-resistant and drip-proof construction, making it suitable for use in challenging weather conditions when paired with compatible Pentax DSLR bodies.

Autofocus System: Equipped with a built-in supersonic motor (SDM), the lens provides smooth and quiet autofocus operation. The Quick-Shift Focus System allows for instant switching to manual focus after autofocus is engaged.

Close Focusing Distance: The closest focusing distance is 1.0m, with a maximum magnification ratio of 0.17x, allowing for detailed close-up photography.

Filter Size: The lens accepts 67mm filters, providing versatility for various photographic effects.