Sigma 24mm f/1.8 EX DG lens

Sigma 24mm f/1.8 EX DG
Maker Sigma Corporation
Key features
Ultrasonic motor n/a
Short back focus n/a
Image stabilization  No
Macro capable  Yes
Unique features Very fast maximum aperture
Application low-light, landscape, macro, general purpose wide angle
Technical data
Type wide angle lens
Focal length 24 mm
Crop factor 84 degrees (FX or 35mm), 62 degrees ( DX or APS-C)
Aperture (max/min) f/1.8, f/22
Construction 9 groups / 10 elements
Close focus distance 18 cm
Max. magnification 1:2.7
Physical
Max. diameter 84 mm
Max. length 82 mm
Weight 485 g
Filter diameter 77mm
Accessories
Lens hood included (bayonet)
Case included (soft)
Angle of view
Horizontal 73 degrees (FX or 35mm)/54 degrees (DX or APS-C)
Vertical 54 degrees (FX or 35mm)/37 degrees (DX or APS-C)
Diagonal 84 degrees (FX or 35mm)/62 degrees (DX or APS-C)
Retail info
MSRP US$ $450 (street price $340)


The Sigma 24mm f/1.8 EX DG is wide-angle lens which features a fast f/1.8 maximum aperture for use in low-light situations, and macro focusing capability to a reproduction ratio of 1:2.7. It uses aspherical lens elements. Though intended for 35mm film and full-frame digital SLRs, this lens is available for several makes of APS-C digital SLR cameras, where the angle of view is similar to a moderate wide-angle lens (in the 35mm-40mm range, depending on the size of the D-SLR sensor).

This lens is capable of macro photography, with minimum focusing down to 18cm/7.1" (reproduction ratio 1:2.7). It incorporates a floating focus system in order to minimize distortion, spherical aberration and astigmatism, and provides high performance at all shooting distances. The high reproduction ratio and wide angle of view allow capturing high quality images not only of a subject but also the surrounding scenery.

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