This Pentax HD FA 85mm f/1.4 ED SDM AW Large-Aperture, Medium Telephoto Lens is the second single-focus lens of the new generation Pentax Star lens series. Designed for use with Pentax K-mount digital SLR cameras, this lens boasts the high imaging performance. Featuring high-grade Super ED (Extra-low Dispersion) glass optical elements and an aspherical optical element, multi-layer HD Coating and a newly designed, large ring-type SDM, this lens delivers extra-clear, high-contrast images with edge-to-edge sharpness by compensating various aberrations to a minimum— in particular, effectively minimizing axial chromatic aberration to prevent the generation of purple fringing in back-lit situations, exceptional imaging power and flawless, high-speed autofocus operation.

High-Performance Lens with Large f/1.4 Maximum Aperture

This 85mm medium telephoto lens is designed to deliver extra-clear, high-contrast images with edge-to-edge sharpness by compensating various aberrations to a minimum, while greatly enhancing resolving power. It provides exceptionally high imaging performance even at open aperture, a beautiful bokeh (defocus) effect and outstanding image rendition at close ranges. The extra-large f/1.4 maximum aperture is useful with many different subjects in a range of applications, including portraiture with an effectively defocused background, handheld shooting of indoor scenes and scenic photography.

Optical Technology

This lens incorporates three Super ED (Extra-low Dispersion) glass optical elements to effectively minimize chromatic aberration, a glass molded aspherical optical element to effectively compensate for spherical and chromatic aberrations and field curvature to deliver extra-clear, high-contrast images with edge-to-edge sharpness, even at open aperture. It also reduces distortion to nearly zero at a focusing distance of four meters to deliver well-defined, distortion-free images over the entire focusing range, from the minimum focusing distance to infinity. The lens is also treated with high-grade, multi-layer HD Coating, which reduces average reflectance in the visible ray spectrum to less than 50% of conventional multi-layer coatings, effectively reducing flare and ghost images to a minimum even in demanding lighting conditions such as backlighting. 

Large Ring-Type SDM

In order to deliver the highest image quality possible over the entire focusing range — from the minimum focusing distance to infinity — this lens features an newly designed, large ring-type SDM to efficiently drive the focusing mechanism, which consists of a larger number of optical elements than ordinary lenses, and is required to shift heavy rear-optical-element groups in unison. Generating a torque approximately 1.3 times that of the unit installed in the HD PENTAX-D FA 50mm f1.4 SDM AW, this SDM assures flawless, high-speed autofocus operation. 

Dustproof, Weather-Resistant Construction

Developed as an All Weather (AW) model, this lens features a dependable dustproof, weather-resistant structure with eight special seals to prevent the intrusion of water into the lens interior. When paired with a PENTAX dustproof, weather-resistant digital SLR camera body, it assures a durable, reliable digital imaging system that performs superbly in demanding outdoor shooting settings. Additionally, the SP (Super Protect) coating applied to the front surface of the lens to effectively repel water and grease.

Rounded Diaphragm

Nine-blade, round-shaped diaphragm produces a natural, beautiful bokeh (defocus) effect up to the f/2.8 aperture setting, while minimizing the streaking effect of point light sources. The quick-shift focus system allows for instant switching from auto-focus to manual-focus operation.