The 18-200mm f/3.5-6.3 DC Macro HSM Lens For Pentax Digital Cameras from Sigma is an all-in-one lens covering an 11x zoom from wide-angle to telephoto, with a 35mm equivalent focal length of 27-300mm. A built-in Hyper Sonic Motor delivers quick and quiet autofocus. The 18-200mm's optical design incorporates double-sided aspherical lenses which enable this extended super-zoom lens to be housed in a compact and lightweight construction. Special Low Dispersion (SLD) glass, correct chromatic aberrations, and Super Multi-Layer Coating reduces flare and ghosting, to provide sharp, high contrast images even in backlit conditions. Macro CapabilityWith a minimum focusing distance of 15.4" (39 cm) and a magnification ratio of 1:3, the lens also acts as a macro lens. The maximum magnification for each focal length is indicated on the lens barrel. The product name on the front of the lens has been engraved, rather than painted, so that when shooting reflective objects up close, the letters will not show up in the image.Thermally Stable CompositeTSC has the same level of thermal shrinkage as aluminum, with little elasticity, especially in temperature changes. This gives the lens high affinity to metal parts, and results in slimmer mechanical parts.7 Blade-Rounded DiaphragmThe diaphragm creates aesthetically pleasing bokeh, or out of focus areas in images.Brass Bayonet MountThe bayonet mount on this lens is made from brass, which is highly accurate and durable, making this lens ideal for long-term use.USB DockCompatible with the Sigma USB Dock, which can update lens firmware and adjust parameters, such as

General

• Filter Thread: 62mm
• Dimensions (D x L): 2.8 x 3.4-inches
• Weight: 15.2 ounces 

Lens Performance

• Focal Length: 18 - 200mm
• Aperture: f/3.5 to 6.3 - f/22
• Camera Mount Type: Pentax K
• Format Compatibility: APS-C
• Lens Construction: 16 elements in 13 groups
• Angle of View: 76.5 - 8.1 degrees
• Maximum Magnifications: 1:3
• Number of Diaphragm Blades: 7 (Rounded diaphragm)
• Minimum Focusing Distance: 15.4-inches

Features

• Autofocus: Yes

• Petal Type Lens Hood
• Front Lens Cap
• Rear Lens Cap
• Brand New Factory Fresh Import Model