The HD PENTAX-DA 18-50mm F4-5.6 DC WR RE features a ne.wly developed retractable mechanism for easy storage and outstanding portability, as well as a weather-resistant construction for dependable operation under all shooting conditions.Overview:The HD PENTAX-DA 18-50mm F4-5.6 DC WR RE, designed for use with PENTAX K-mount lens-interchangeable digital cameras. This standard zoom lens features a ne.wly developed retractable mechanism for easy storage and outstanding portability, as well as a weather-resistant construction for dependable operation under all shooting conditions.This standard zoom lens has been developed as a compact, easy-to-use everyday lens that meets user demand for a downsized, high-resolution digital SLR imaging system. Thanks to its retractable mechanism employed for the first time in the PENTAX K-mount lens system it provides the worlds shortest length in the stored position: just 41 millimeters*. Despite its ultra-compact design that assures outstanding portability, it also features the PENTAX-original HD Coating, super-low dispersion glass elements and aspherical elements to effectively compensate various aberrations for sharp, high-contrast, well-balanced images. Its built-in DC motor assures smooth, quiet autofocus operation, while its weather-resistant body makes it extremely dependable and durable in demanding outdoor conditions.The worlds shortest standard zoom lens for use with digital SLR cameras (as of February 1, 2015, based on RICOH IMAGING research)Super thin standard zoom eq to 27-76mm in 35mm, with retractable mechanism for more compacity and portabilityDependable weather-resistant construction against water infiltrationSmooth, quiet autofocus operation driven by a built-in DC motorHD Coating to optimize light transmittance and minimize reflectionRound shaped diaphragm to produce beautiful bokehSuper Protect coating of the front lens element for effective protectionFast manual focusing in AF mode with Quick Shift focus systemUltracompact with only 41mm heightEquipped with a push button to prevent wrong operationLenshood includedThe worlds shortest standard zoom lensThis standard zoom lens of/ers a zoom ratio of approximately 2.8 times to cover the wide-angle to standard ranges (for focal lengths equivalent to 27.5mm to 76.5mm in the 35mm format), which are the most frequently used ranges in general photographic applications. Thanks to its ne.w retractable mechanism, it measures a mere 41 millimeters in length in the stored position the worlds shortest for a standard zoom lens to assure outstanding portability in combination with todays downsized digital SLR camera body.Dependable weather-resistant constructionThis lens features a dependable weather-resistant construction with nine special seals to effectively prevent the intrusion of water into the interior. By pairing it with a weather-resistant PENTAX digital SLR camera body, the user is assured of a durable, reliable digital imaging system that performs superbly in demanding shooting settings even in the rain or mist, or at locations prone to water splashes or spray.Exceptional image rendition to accommodate latest digital SLR camerasIncorporating super-low dispersion glass elements and aspherical elements in its 11-element/eight-group optics, this lens effectively compensates various aberrations for high-contrast, high-resolution, fine-detailed images with minimal color bleeding.