Do you really need more than 1 lens? Maybe not--this Sigma 50-500mm F/4.5-6.3 APO DG OS HSM Lens for Pentax covers a lot of ground. The 10x zoom can be used on everything from landscape and portrait photos to sports action and wildlife photography. It uses 4 Special Low Dispersion (SLD) glass elements for optimum color correction and sharpness through the entire zoom range, and a Hyper-Sonic Motor (HSM) provides quiet and high-speed auto focusing. The Optical Stabilization (OS) system allows you to use the lens even off a tripod to capture sharp, clear photos.  Note: Pentax mounts do not have an aperture ring--some functions may not work depending on the camera model. Note: It is not possible to use the AF and the built-in OS function of this lens when attaching it to film SLR cameras as well as Pentax *ist series and K100D. Note: When using the OS function of a lens with a camera which incorporates a stabilizer unit, please turn the camera's stabilizer unit off. 10x high zoom, ultra telephoto zoom lensDesigned for use with full-frame DSLR cameras, however can also be used with APS-C models where it will provide a 75-750mm equivalent focal length rangeOS System (Optical Stabilization) allowing handheld photography even in low-light situationHSM (Hyper-Sonic Motor) ensures a quiet & high-speed auto focusFour SLD (Special Low Dispersion) glass elements provide optimum color correction & sharpness throughout the entire zoom

Name	Sigma 50-500mm f/4.5-6.3 DG OS HSM APO
Image Circle	35mm
Type	Telephoto Zoom
Focal Length	50-500mm
APS Equivalent	1.5x: 75-750mm; 1.6x: 80-800mm
Max Aperture	f/4.5 - 6.3
Min Aperture	f/22
Diaphragm Blades	9 (rounded)
Lens Construction	22 elements in 16 groups, including 4 SLD elements
Diagonal Angle of View (Based on image circle)	46.8 to 5.0 degrees
Focus Details	Internal; HSM with full-time manual override
Front Element Rotation	No
Zoom System	Rotary with lock
Closest Focus	50 - 180cm / 9.7 in. - 70.9 in.
Magnification Ratio	0.32x / 1:3.1 (200mm)
Filter Size	95mm

• Front & Rear Caps
• Lens Hood
• Tripod Collar
• Step-down Ring 95-86mm
• Case
• Strap
• Brand New Factory Fresh Import Model