The latest optical design technologies have enabled exceptional imaging performance in this lens. It incorporates one ED (Extra-low Dispersion) glass optical element and two Anomalous Dispersion glass optical elements to compensate for various aberrations and minimize the generation of unwanted purple fringe effects. Additionally, the high-grade, multi-layer HD (High Definition) Coating significantly reduces average reflectance in the visible ray spectrum to less than 50% compared to conventional models, while the innovative FREE (Fixed Rear Element Extension) focusing system effectively reduces the generation of flare and ghost images across the entire focus range, from minimum distance to infinity. These technologies work in harmony to deliver clear, high-quality images.

The lens also provides life-size magnification in close-range shooting, allowing for the capture of dramatic, fine-detailed close-up images.

Designed for exceptional outdoor shooting reliability, the lens features dustproof, weather-resistant AW (All Weather) construction, a first for a PENTAX macro lens. This dependable construction, with six sealing parts to optimize airtight performance, prevents the intrusion of dust and moisture into the interior. When mounted on a compatible PENTAX digital SLR camera body, it creates a highly dependable, durable imaging system that performs superbly in demanding shooting settings, such as snow, mist, rain, or locations prone to splashing or spraying water.

The lens's attractive, stylish appearance is complemented by its metallic exterior parts, meticulously machined from high-grade aluminum. Its focus ring features the PENTAX-original Quick-Shift Focus System, which allows the photographer to instantly shift the focus mode from auto to manual after the subject has been captured in focus by the camera's autofocus system. This single-action operation assures a smooth, comfortable focus-mode switching maneuver during manual-focus shooting, significantly improving operability.

Despite the greatly improved imaging power and outstanding AW construction, the lens is designed to be nearly as compact and lightweight as the smc PENTAX-D FA MACRO 100mm F2.8 WR, introduced in 2009. This compact, lightweight design, combined with excellent weight distribution and ergonomics, ensures outstanding maneuverability.

Additional features include a working distance of 5.1 inches (13 centimeters) at life-size magnification, allowing for the shooting of unapproachable subjects, such as insects. Each lens is assigned an individual serial number, with black models starting at 0000001 and the silver model at 1000001. The circular diaphragm produces a natural, beautiful bokeh (defocus) effect from open aperture to F5.6, while minimizing the streaking effect of point light sources. Finally, the lens features PENTAX's SP (Super Protect) Coating on the front optical element, keeping the surface free of dust or stains.

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