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Sigma 17-70mm f/2.8-4.5 DC MACRO

 

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.

 

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.

 

One or more 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.

 

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.

 

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.

It can be used with wide variety of subjects and it is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size image sensor. This lens has a minimum focusing distance of 20cm throughout the entire zoom range. Maximum magnification of 1:2.3 enables close-up photography like a macro lens. The new lens design and multi layer lens coating reduce flare and ghosting, which is a common problem with digital cameras. A Special Low Dispersion (SLD) lens and two aspherical lens elements provide excellent correction for all types of aberrations and produce a high level of optical performance throughout the entire zoom range. The lens design incorporates an inner focusing system, which ensures fast AF speed as well as prevents the front of the lens rotating, making it particularly suitable for use with circular polarizing filters and petal shaped lens hoods. This lens is also equipped with Zoom Lock Switch that eliminates «Zoom Creep» during transportation

Sigma 17-70mm f/2.8-4.5 DC MACRO Specification

Available mount(s) Canon EF, Nikon F, Pentax K, Sony / Minolta A, Sigma
Application(s) Portrait, Closeup, Landscape, Architecture
Category(s) Standard zoom, Macro
Multiplier 1.5×
Stabilizer no
Focal length 17 - 70 mm (4.10× zoom)
Lens construction 15 elements in 12 groups
Angle of view 35mm: N/A
digital: 74.4-20.2°
Number of blades 7
Maximum aperture wide: f/2.8 tele: f/4.5
Minimum aperture wide: f/22 tele: N/A
Minimum focusing distance 20 cm
Magnification 0.43×
Filter size 72 mm
Size ∅ 79 × 82.5 mm
Weight 455 g
Notes
AF speed 0.5 sec. (from close up to infinity)
AF sound
Internal focusing yes
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed N/A
Drop in filter no
Ultrasonic AF no
Stepping motor AF no
APS-C sized circle yes
Low dispersion lens element yes
Hard case N/A
Soft case N/A
Lens hood LH780-04
printable lens hood
Tripod adapter N/A
Discontinued yes
Sigma 17-70mm f/2.8-4.5 DC MACRO Specification

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Sigma 17-70mm f/2.8-4.5 DC MACRO Sample Photos

Canon EOS-400D + 17-70mm f/2.8-4.5 DC MACRO

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