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Sigma 120-300mm f/2.8 APO EX DG OS HSM

Sigma 120-300mm f/2.8 APO EX DG OS HSM lens
 

Full frame sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.

 

Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

One or more Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Built-in image stabilizer

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

 

Metal mount

Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important.

 

Internal Focusing

Internally focusing lenses don't change their size while setting focus.

 

Internal Zoom

Internally zooming lenses don't change their size while focal length is changing.

 

The front lens is fixed

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.

 

Weather Sealed

Weather sealed lenses are protected from dust and water. While they are not water proof, these lenses can be used in rain and other humid environments. Some sealings only provide protection against dust or water, not both. Sealing is only available when the lens is used on a similarly weather sealed camera body.

 

No drop-in filter support

Drop-in filters are used in those lenses where either the front lens is too large, or the field of view doesn't permit the use of traditional filters at the front of the lens. Usually bright tele and ultra-wide angle lenses support this filter type.

Sigma 120-300mm f/2.8 APO EX DG OS HSM Specification

Available mount(s) Canon EF, Nikon F, Sigma
Application(s) Portrait, Sports, Wildlife
Category(s) Tele zoom
Multiplier N/A
Stabilizer yes (4 f-stop advantage)
Focal length 120 - 300 mm (2.5× zoom)
Lens construction 23 elements in 18 groups
Angle of view 35mm: 20.4-8.2°
digital: 11.8-4.7°
Number of blades 9
Maximum aperture wide: f/2.8 tele: f/2.8
Minimum aperture wide: f/22 tele: N/A
Minimum focusing distance 250 cm
Magnification 0.12×
Filter size 105 mm
Size ∅ 114.4 × 289.2 mm
Weight N/A
Notes
AF speed N/A
AF sound
Internal focusing yes
Internal zoom yes
Fix front lens yes
Mount type metal
Weather sealed yes
Drop in filter no
Ultrasonic AF yes
Stepping motor AF no
APS-C sized circle no
Low dispersion lens element yes
Hard case N/A
Soft case N/A
Lens hood N/A
Tripod adapter N/A
Discontinued yes
Sigma 120-300mm f/2.8 APO EX DG OS HSM Specification

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