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Sigma 50-100mm f/1.8 DC HSM A

Sigma 50-100mm f/1.8 DC HSM A lens
Sigma 50-100mm f/1.8 DC HSM A lens
 

APS-C 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.

 

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.

 

No 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.

 

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 50-100mm f/1.8 DC HSM A Specification

Available mount(s) Canon EF, Nikon F, Sigma
Application(s) Portrait, Sports, Landscape
Category(s) Tele zoom
Multiplier 1.5×
Stabilizer N/A
Focal length 50 - 100 mm (2× zoom)
Lens construction 21 elements in 15 groups
Angle of view 35mm: N/A
digital: 31.7-16.2°
Number of blades 9
Maximum aperture wide: f/1.8 tele: f/1.8
Minimum aperture wide: f/16 tele: f/16
Minimum focusing distance 95 cm
Magnification 0.15×
Filter size 82 mm
Size ∅ 93.5 × 170.7 mm
Weight 1490 g
Notes With 3 FLD, 4 SLD lens elements, and integrated tripod collar.
AF speed N/A
AF sound
Internal focusing yes
Internal zoom no
Fix front lens yes
Mount type metal
Weather sealed N/A
Drop in filter no
Ultrasonic AF yes
Stepping motor AF no
APS-C sized circle yes
Low dispersion lens element yes
Hard case N/A
Soft case N/A
Lens hood N/A
Tripod adapter N/A
Sigma 50-100mm f/1.8 DC HSM A Specification

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