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Sigma 28-105mm F2.8-4 DG

Sigma 28-105mm F2.8-4 DG lens
Sigma 28-105mm F2.8-4 DG 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.

 

No 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.

 

No Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Not stabilized

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.

 

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.

 

Not 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.

A large aperture standard zoom lens that covers from wide-angle to telephoto and ideal for digital SLR cameras. This standard zoom lens covers frequently used focal lengths from 28mm to 105mm and allows a large aperture of F2.8 at the 28mm focal length. It is very convenient for a wide range of applications including snap shots, indoor photography. An ideal lens for Digital SLR Cameras as well as 35mm Film SLR Cameras. The new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras, and also creates an optimum color balance throughout the entire zoom range. The use of aspherical lens reduces various aberrations throughout the entire zoom range and improves optical performance. This lens has minimum focusing distance of 50cm throughout the entire zoom range and it has also maximum magnification of 1:5.5. An inner focusing system eliminates front lens rotation, making the lens particularly suitable for using the petal-type lens hood supplied and also circular polarizing filters.

Sigma 28-105mm F2.8-4 DG Specification

Available mount(s) Canon EF, Nikon F, Pentax K, Sony / Minolta A, Sigma
Application(s) Portrait, Landscape, Architecture
Category(s) Standard zoom
Multiplier
Stabilizer no
Focal length 28 - 105 mm (3.8× zoom)
Lens construction 12 elements in 11 groups
Angle of view 35mm: 75.4-23.3°
digital: N/A
Number of blades 8
Maximum aperture wide: f/2.8 tele: f/4
Minimum aperture wide: f/22 tele: N/A
Minimum focusing distance 50 cm
Magnification 0.18×
Filter size 72 mm
Size ∅ 77 × 79.5 mm
Weight 405 g
Notes
AF speed N/A
AF sound
Internal focusing N/A
Internal zoom no
Fix front lens yes
Mount type metal
Weather sealed no
Drop in filter no
Ultrasonic AF no
Stepping motor AF no
APS-C sized circle no
Low dispersion lens element no
Hard case N/A
Soft case N/A
Lens hood N/A
printable lens hood
Tripod adapter N/A
Discontinued yes
Sigma 28-105mm F2.8-4 DG Specification

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