Sigma 28-105mm F2.8-4 DG

	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.

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.

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

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	1×
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

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Sigma 28-105mm F2.8-4 DG

Full frame sized image

No Ultrasonic AF

No stepping motor AF

No Low Dispersion lens element is used

Not stabilized

Metal mount

No Internal Zoom

The front lens is fixed

Not Sealed

No drop-in filter support

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

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