Overview: The Sigma 50-500mm F4.5-6.3 APO DG OS HSM (Model #738) is a
high quality, high-powered ultra-telephoto zoom lens. Typical uses include travel,
and nature and wildlife photography . The lens has the
Canon F-mount, and comes with a lens hood, and front and rear caps. The
included tripod collar allows you to attach a tripod at the lens (instead of at
the camera) for better balance and control.
Optics: The lens features four SLD (special low dispersion)
glass elements for excellent sharpness and color correction throughout the
entire zoom range. Super Multi-Layer Coating helps to reduce lens flare and
Lens Hood: The lens includes a bayonet-type
detachable lens hood to help
prevent stray light from entering the lens, causing flare, and to protect the
lens from rain, snow, and dust. When not in use, the lens hood can be inverted
and mounted onto the lens backwards for storage.
Focus Mode Switch: The lens features a two-way switch for
setting the focus mode: AF (auto focus) or M (manual focus).
Optical Stabilization (OS): The lens also has built-in optical stabilization
with two modes. Using the OS feature, it is possible to get sharp results at shutter
speeds approximately 4 stops slower than you could without it. Mode 1 stabilizes
the image when the lens is zoomed in on a distant object, and eliminates blurry
images caused by camera shake. Mode 2 detects vertical camera shake, and is most
effective when panning the camera horizontally to follow a moving subject.
Zoom Lock: The lens can extend an additional 3-1/2" when
zoomed completely out. The Zoom Lock switch helps to prevent the lens from
extending on its own when the lens is pointed downward.
Sigma DG Lenses: This Sigma DG lens is designed for use with
full-frame digital SLRs. An APS-C hood adapter is included to provide more
effective shading when the lens is used with a digital camera with an APS-C size
HSM: The lens has a hyper-sonic motor (HSM) that provides a
quiet, high-speed auto focusing mechanism.
Step-down Ring: The 50-500mm zoom lens has a 95mm filter
thread. Included with the lens is a step-down ring that allows you to attach
86mm screw-on filters. Using the step-down ring with full-frame cameras causes
vignetting, so the ring should only be used with cameras with APS-C sized image
sensors. You should not use a Polarizing Filter with the step-down ring, because
you may not be able to remove it from the lens again.
Flash Photography: Because of the length of the lens, it is
recommended that only an external flash unit be used. Using the camera's
built-in flash will result in shadows in the photograph caused by the lens
Optional Teleconverters: The lens is compatible with Sigma's
1.4x EX or 2.0x EX APO Tele-converters. With the 1.4x teleconverter
attached, the lens has a focal length of 70-70mm. Using the 2.0x teleconverter,
the focal length becomes 100-1000mm.
- Lens Construction: 22 Elements in 16 Groups
- Angle of View: 46.8°-5.0°
- Number of Diaphragm Blades: 9
- Maximum Aperture: f/4.5 (W) f/6.3 (T)
- Minimum Aperture: f/22 (W-T)
- Minimum Focusing Distance: 19.7" (at 50mm); 70.9" (at
- Filter Size: 95mm (86mm with step-down ring)
- Maximum Magnifications: 1:3.1
- Dimensions: Diameter=4.117", Length=8.94", (9.477"
- Weight: 69.5 ounces
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