Designed specifically for APS-C sized sensors and the Pentax K-mount cameras, the 18-35mm lens is the first wide-angle to standard zoom lens to achieve a large aperture of 1.8. This unique lens offers exceptional versatility and performance.

One of the key features of this lens is its internal focusing and zooming mechanism. This design allows for more usability and functionality, as the lens barrel does not extend during operation. This makes the lens more compact and easier to handle, particularly when shooting in tight spaces or using a tripod.

The 18-35mm focal length range provides a versatile coverage, from wide-angle to standard zoom. This range is ideal for a wide variety of photographic applications, including landscapes, portraits, still life, snapshots, casual photography, and close-ups. The large maximum aperture of f/1.8 offers excellent low-light performance and the ability to create shallow depth of field effects for beautiful background blur.

The minimum focusing distance of this lens is an impressive 28 cm (11 inches), allowing you to get up close and personal with your subjects. This makes the 18-35mm lens well-suited for macro-style photography, where you can capture intricate details and creative compositions.

In terms of optical design, the 18-35mm lens utilizes a sophisticated arrangement of 16 elements in 12 groups, including two aspherical elements and one extra-low dispersion (ED) element. This advanced optical construction helps to minimize various aberrations and deliver exceptional image quality across the entire zoom range.

The lens also features a rounded 9-blade diaphragm, which contributes to the creation of smooth, pleasant-looking bokeh (the out-of-focus areas of the image). This is particularly beneficial for portrait and still life photography, where a soft, creamy background can help to isolate and emphasize the primary subject.

Regarding the construction of the lens, it is built with a durable metal barrel and high-quality components. This ensures long-lasting durability and reliable performance, even in challenging shooting conditions. The lens also features a weather-resistant design, with sealing around the mount and other critical areas, making it well-suited for outdoor use in various weather conditions.

In conclusion, the 18-35mm f/1.8 lens is a versatile and high-performance optic that offers a unique combination of a wide-angle to standard zoom range and a large maximum aperture. Its internal focusing and zooming mechanism, coupled with its impressive optical quality and close-focusing capabilities, make it a valuable tool for a wide range of photographic applications. Whether you're capturing landscapes, portraits, or intimate details, this lens is sure to deliver outstanding results.

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