Sigma AF 10-20mm f/4-5.6D DC-HSM

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Introduction

The sigma 10-20mm is an ultra wide angle DX lens, featuring: ASP (Aspherical Lens), HSM (Hyper-Sonic Motor, equivalent to Nikons AF-S but slower), IF (Internal Focus), EX (The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance) As you will find out on this review that's one thing i really dislike). And DC (These are special lenses designed so that the image circle matches the smaller size of the image sensor of most digital SLR cameras(DX).

Specifications

Lens Construction: 14 elements in 10 groups (3 SLD elements)

Picture Angle: 102.4/63.8 degrees

Filter Size: 77mm

Included accessories: Front & Rear Lens Cap, Lens Hood, Case

Size and weight: 83.5mm x 81mm/3.3in x 3.2in, 465g./16.4oz.

Diaphragm: 6 Bladed

Price from: $ 499.00 USD

Positives

• 10mm performance.
• Price.
• World wide warranty, something other companies should have, particularly Nikon.
• Sharp, this lens shows good sharpness @ 10mm, even from f/4

Drawbacks

• Poor IR performance, this lens is not suitable for IR photography, as it hot-spots badly.
• Bad lens cap, Sigma really need to fix their lens caps.
• Complex distortions. specially @ 14-20mm.
• 20mm performance.
• Variable aperture.
• G-type aperture.
• EX. I know allot of people like this velvety like thing, to me it feels like a bad toy, and it makes the lens look bad also.
• Focus ring, the focus ring is too stiff for my liking.
• Vignetting quite a bit @ 10mm f/4.
• Slow auto-focus.
• No DOF/IR markings

Verdict

This is a pretty decent lens, with its best performance on 10mm, and pretty bad performance on 20 mm. I personally really dislike the EX finish, to me that gives me the feel of cheap optics. As you can see I find this lens to have more drawbacks then positives, that said the lens is usable, especially around 10mm, where it delivers very straight lines, compared to how wide this lens is. If you enjoy taking IR photography, this is definitely not the lens for you.

Alternatives

Tokina AF 10-17mm f/3.5-4.5 AT-X 107 DX. From: $559.95 USD

Nikon AF-S 12-24 f/4G ED-IF AF-S DX. From: $894.95 USD

Tokina AF 12-24mm f/4 AT-X 124AF Pro DX. From: $499.95 USD

Sigma AF 12-24mm f/4.5-5.6 EX Aspherical DG HSM. From: $689.00 USD

Sample Pictures

As you can see in this sample shot, this lens hot-spots really bad when used for IR, the picture have been over exaggerated to show the hot-spot more, you can also see the vignetting in this, shot.

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