20mm f/1.8 EX DG ASP RF
Lens Hood
Fitted Padded Case
Front and Rear Caps
Instruction Manual
1 Year Warranty Card
2 Year Extended UK Warranty Card

 

  

Wide Lens
20mm f/1.8 EX DG ASPHERICAL RF

Wide angle lens with large aperture and superior peripheral brightness

This super-wide-angle lens is ensured minimal light-fall-off with superior peripheral brightness. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. This is an ideal DG lens optimized Digital SLR camera.

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Minimum focus distance of 20cm
The minimum focusing distance of this lens is 20cm and it has maximum magnification of 1:4 with fast F 1.8 maximum aperture. The minimum focusing distance of 20cm and 94.5 degree angle of view allow close up photography surrounding the photographic subject.

Handling
The lens incorporates Dual-Focus (DF) mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. The rear focus system eliminates the need for the front of the lens to rotate, thus allowing the use of a "Petal-type hood", which is superior light blocking effect.

Incorporated aspherical lenses
The use of aspherical lens elements in both of the front and rear lens groups effectively compensates for distortion, spherical aberration and astigmatism.

Lens Construction
13 Elements in 11 Groups
Angle of View
94.5 degrees
Number of Diaphragm Blades
9 Blades
Minimum Aperture
F22
Minimum Focusing Distance
20cm
Maximum Magnification
1:4
Filter Size
82mm
Dimensions
Diameter 88.6mm X Length 89.5mm
Weight
520g
SRP
£349.99

20mm f/1.8 EX DG ASP RF
SIGMA
CANON
NIKON (D)
SONY
PENTAX


BACK

British Journal of Photography - 25th July 2001
’Aspherical elements in the front and rear have reduced astigmatism and spherical aberration to acceptable levels for general professional needs so press, PR, sporting, landscape and travel workers should not be disappointed. The maximum aperture is important not just because of its ‘on paper’ speed, but also because all of the range is fully usable.’

   
Amateur Photographer - September 2001
The colour is accurate and contrast is punchy without being too hard. The lens holds shadow and highlight detail very well. Light dispersion throughout the aperture range is excellent with no vignetting. Even at f/1.8 the depth of field is fairly deep especially at the upper reaches of the lens's distance scale, and I had no problems achieving satisfying results in low-light conditions.
VERDICT: I am very pleased with the results from the SIGMA 20mm f/1.8 - so much so that I really, really want one.
   
Practical Photography - April 2003
'Fixed focal length wide-angles have become something of a rarity among independent manufacturers, this 20mm lens from Sigma not only surprises on that score but offers an amazing f/1.8 maximum aperture as well. Even though it’s clearly aimed at digital SLR users, this lens is a welcome addition to the arsenal of lenses available to film users due to its low light capabilities.’
   
Digital Camera Buyer - Isuue 53
’The unique selling point of this particular lens is its fast maximum aperture of f/1.8. In the field, the Sigma delivered some very nice images, with its woodland shot being equally as highly defined as the Canon. At minimum aperture it rendered near and distant detail equally well, and it controlled flare better than any of the other lenses.’
 

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