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Sigma 28mm f/1.4 DG HSM A

Sigma 28mm f/1.4 DG HSM A lens
 

Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be 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.

 

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.

 

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 28mm f/1.4 DG HSM A Specification

Available mount(s) Canon EF, Nikon F, Sony / Minolta A, Sigma
Application(s) Landscape, Architecture
Category(s) Wide angle prime
Multiplier N/A
Stabilizer N/A
Focal length 28 mm (prime)
Lens construction 17 elements in 12 groups
Angle of view 35mm: 75.4°
digital: N/A
Number of blades 9
Maximum aperture f/1.4
Minimum aperture N/A
Minimum focusing distance 28 cm
Magnification N/A
Filter size 77 mm
Size ∅ 82.8 × 107.7 mm
Weight N/A
Notes
AF speed N/A
AF sound
Internal focusing yes
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed yes
Drop in filter no
Ultrasonic AF yes
Stepping motor AF N/A
APS-C sized circle N/A
Low dispersion lens element yes
Hard case N/A
Soft case N/A
Lens hood included
Tripod adapter not included
Sigma 28mm f/1.4 DG HSM A Specification

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