Sigma 20-40mm f2.8 EX DG ASPHERICAL | Sigma | Lenses

Overview

Wide Zoom Lens
20-40mm f/2.8 EX DG ASPHERICAL

A Large-aperture-wide-zoom lens from 20mm with large F2.8 aperture

SIGMA has created a new 20-40mm lens with F2.8 hroughout its zoom range, from ultra-wide 94.5 degrees to near-standard 56.8 degrees Angle of view, for photographers to shoot more creatively from various angles and zoom perspectives. With a fast F2.8 maximum aperture superior peripheral Brightness is ensured. This lens is perfectly suited for indoor shootings even in dim light without worrying about blurring in photos. These features also make this lens desirable for use with Digital SLR Cameras.

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30cm minimum focusing distance throughout the zoom range
The lens' 30cm minimum focusing distance is useful for closeups, giving photographers plenty of capability to use the zoom to adjust composition and concentrate on detail, as desired. Maximum magnification is 1:4.6. A short focus distance and a minimum aperture of F22 provides greater Depth of field.

Aspherical lens compensates for Aberration
Aspherical lens elements in front and rear lens groups compensate for astigmatic and Spherical aberration, respectively. By reducing aberration to an absolute minimum, this SIGMA lens overcomes a major impediment to zoom lens performance.

Sophisticated, yet simple to use
Among the practical high-performance features of the lens are DF (Dual Focus) mechanism for optimal handling stability during autofocus operation; a wider-than-conventional focal ring for superior manual focusing operation; and an Inner focusing system that eliminates front lens rotation during focusing, and allows use of the standard petal-type hood accessory, which is excellent at blocking out extraneous light.

Lens Construction		17 Elements in 13 Groups
Angle of View		94.5 - 56.8 degrees
Number of Diaphragm Blades		9 Blades
Minimum Aperture		F22
Minimum Focusing Distance		30cm
Maximum Magnification		1:4.6
Filter Size		82mm
Dimensions		Diameter 89mm X Length 107.8mm
Weight		600g
SRP		£649.99

20-40mm f/2.8 EX DG ASP		SIGMA
		CANON
		NIKON (D)
		SONY
		PENTAX

Lens Specifications

Generic Lens Specifications

Lens Type: Zoom
IS / VR / OS: None
Min Focal length (mm): 20
Max Focal Length (mm): 40
Number of Elements: 17
Element Groups: 13
Max Aperture: 2.8
Minimum Aperture: 22
Diaphragm Blades: 9
Closest Focus Distance (m): 0.3
Maximum Magnification: 1.4
Filter Diameter (mm): 82
Diameter at widest (mm): 89
Lens Length (mm): 108
Weight (g): 600

Details

20-40mm f/2.8 EX DG ASP

Lens Hood

Fitted Padded Case

Front and Rear Caps

Instruction Manual

1 Year Warranty Card

2 Year Extended UK Warranty Card

Price Tracking

USA Lens Price History

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Editor review : Sigma 20-40mm f2.8 EX DG ASPHERICAL


Overall rating (weighted)		3.5
Sharpness		3.0
Build Quality		3.0
AF Speed		4.0
Value for Money		4.0

This is a sizeable lens, though it's suprisingly lightweight, given the constant f/2.8 maximum aperture. Once set, the focus is a really smooth, fluid action and the autofocus quickly latches on to the subject. This lens offers superb results once stopped down and the lack of distortion will appeal to many. This is a good option for a serious armature that does mind the extra overall size.

Why should you care what I think?

My relationship with this item: Editor review

Conclusions at a glance

Would you recommend this Item: Undecided
Pros: Sharp, smaooth
Cons: Size

Last updated: Wednesday, 06 February 2008

User Lens Reviews

Average user rating from: 3 user(s)


Overall rating (weighted)		4.3
Sharpness		4.0
Build Quality		4.0
AF Speed		4.0
Value for Money		5.0

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0 of 0 people found the following review helpful

sigma 20-40mm ex dg, Saturday, 28 June 2008


Overall rating (weighted)		4.3
Sharpness		4.0
Build Quality		4.0
AF Speed		4.0
Value for Money		5.0

I love this lens and use as my primary walk around lens for street photography. It has very little distortion and sharpness is on par with most primes in its focal range. I do not know why more people did not go for this lens.

My relationship with this item: I own it
Where did you buy this item?: bh photo
Price paid: 249
When did you buy this item?: april 2008

Would you recommend this Item: Yes
Pros: tack sharp stopped down a little, great macro ability, perfect zoom range for normal street photography on a cropped sensor dslr
Cons: sharpness suffers wide open, lens diameter causes a shadow when used with on camera flash

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1 of 1 people found the following review helpful


Overall rating (weighted)		4.3
Sharpness		4.0
Build Quality		4.0
AF Speed		4.0
Value for Money		5.0

I love this lens. I use it as primary walk around lens. It produces minimal distortions and sharpness is on par with most primes in the same focal length. This lens is a steal and I am surprised not many people have tried it out.

My relationship with this item: I own it
Where did you buy this item?: BH PHOTO
Price paid: 249
When did you buy this item?: SPRING 2008

Would you recommend this Item: Yes
Pros: Sharp, low distortions, great macro capability, great focal length for street photography on a cropped sensor
Cons: wide open sharpness suffers, shadow cast when used with on camera flash

Sigma 20-40mm f/2.8 EX DG REVIEW, Saturday, 28 June 2008


Overall rating (weighted)		4.3
Sharpness		4.0
Build Quality		4.0
AF Speed		4.0
Value for Money		5.0

I have used this lens as primary walk around lens for street photography and it has not let me down. I would say it is on par with most prime lenses in the focal range. I like the slip clutch transition from manual to auto focus mode. As always Sigma has the competition beat by supplying a case and hood with the lens. It works well for indoor no flash photos. If you do use flash make sure it is an external flash and not the one built into the camera because the diameter of the lens will cast a shadow on the subject. The macro function of this lens is excellent it allows for some really perspectively creative shots to be captured. I love this lens, it is a keeper.

My relationship with this item: I own it
Where did you buy this item?: BH PHOTO
Price paid: 249
When did you buy this item?: A FEW MONTHS AGO

Would you recommend this Item: Yes
Pros: great image quality with little distortion throughout the range, stopped down a little it is sharp as a tack. Can focus down to 7inches for macro. Can't beat the price.
Cons: wide open sharpness suffers. produces shadow when using on camera flash