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Overview: The Sigma 105mm F2.8 EX DG Macro OS HSM (Model
#258) is a large aperture, medium
telephoto macro lens, designed to be used with full-frame cameras. It can also be
used with smaller APS-C size sensors with an effective increase in focal length
to 157.5mm. It is a
great lens for weddings and events, portraits, nature and wildlife, as well as
macro photography. The lens has the Sigma mount, and comes with a padded
carrying case, lens hood, and APS-C hood adapter.
Lens Hood: The Sigma 105mm lens includes a 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.
APS-C Hood Adapter: If using the lens on a camera with an
APS-C sized image sensor, the included APS-C hood adapter should be mounted
between the lens and the lens hood. The hood adapter provides more effective
shading. If the hood adapter is used with full-frame cameras, vignetting will
Optical Stabilizer (OS): The built-in Optical Stabilizer allows
for handheld photography, even in low light scenarios, and compensates for image
blurring caused by camera shake. There are 2 OS modes: Mode 1 compensates for
overall camera shake, while Mode 2 detects vertical shake that occurs when
panning the camera horizontally.
Focus Mode Switch: The lens features a two-way switch for
setting the focus mode: AF (auto focus) or MF (manual focus).
Sigma Technology: The lens has the following Sigma
- Hyper Sonic Motor (HSM): The Hyper Sonic Motor uses
ultrasonic waves to drive the autofocus mechanism. This extremely quiet
operation helps avoid disturbing photographic subjects, and isn't picked up
by the microphone while recording video.
- Super Multi-layer Coating: Sigma's own Super
Multi-layer Coating suppresses lens flare and ghosting by preventing
reflections within the lens.
- Rounded Diaphragm: Using a rounded diaphragm instead of
a polygonal shaped one produces pleasingly rounded out-of-focus light points
when opened to near maximum aperture.
- Lens Construction: 16 Elements in 11 Groups
- Angle of View: 23.3°
- Number of Diaphragm Blades: 9
- Maximum Aperture: f/2.8
- Minimum Aperture: f/22
- Minimum Focusing Distance: 12.3"
- Filter Size: 62mm
- Maximum Magnifications: 1:1
- Dimensions: Diameter=3.071", Length=5.16"
- Weight: 25.6 ounces