Sigma 10-20mm f/3.5 EX DC HSM

	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. 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. 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.
This super-wide angle lens has a maximum aperture of F3.5 throughout the entire zoon range. Its wide angle of view from 102.4 degrees produces striking images with exaggerated perspective. The maximum aperture of F3.5 is ideal for indoor shooting and it enables photographers to emphasize the subject. Two ELD (Extraordinary Low Dispersion) glass elements and a SLD (Special Low Dispersion) glass element provide excellent correction of color aberration. Four aspherical lenses provide correction for distortion and allow compact and lightweight construction. The Super Multi-Layer coating reduces flare and ghosting.

This super-wide angle lens has a maximum aperture of F3.5 throughout the entire zoon range. Its wide angle of view from 102.4 degrees produces striking images with exaggerated perspective. The maximum aperture of F3.5 is ideal for indoor shooting and it enables photographers to emphasize the subject. Two ELD (Extraordinary Low Dispersion) glass elements and a SLD (Special Low Dispersion) glass element provide excellent correction of color aberration. Four aspherical lenses provide correction for distortion and allow compact and lightweight construction. The Super Multi-Layer coating reduces flare and ghosting.

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Sigma 10-20mm f/3.5 EX DC HSM Specification

Sigma 10-20mm f/3.5 EX DC HSM Specification
Available mount(s)	Canon EF, Nikon F, Pentax K, Sony / Minolta A, Sigma
Application(s)	Landscape, Interiors, Architecture
Category(s)	Wide angle zoom
Multiplier	1.5×
Stabilizer	no
Focal length	10 - 20 mm (2× zoom)
Lens construction	13 elements in 10 groups
Angle of view	35mm: N/A digital: 102.4-63.8°
Number of blades	7
Maximum aperture	wide: f/3.5 tele: f/3.5
Minimum aperture	wide: f/22 tele: f/22
Minimum focusing distance	24 cm
Magnification	0.15×
Filter size	82 mm
Size	∅ 87.3 × 88.2 mm
Weight	520 g
Notes	2 ELD, 1 SLD and 4 aspherical elements. Super Multi-Layer coating
AF speed	N/A
AF sound
Internal focusing	N/A
Internal zoom	N/A
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	not included
Soft case	not included
Lens hood	LH873-01 (included)
Tripod adapter	not included