vs

differences

Reasons to consider the Sigma 10-20mm f/4-5.6 EX DC HSM Canon-ef

Slightly shorter 81 mm vs 97 mm
Help
Around 20% shorter
Slightly cheaper $479.00 vs $739.00
Help
The best price we've seen is $260 cheaper (around 40% less)
Sigma 10-20mm f/4-5.6 EX DC HSM Canon-ef Learn more about
the Sigma 10-20mm f/4-5.6 EX DC HSM Canon-ef

Reasons to consider the Canon EF 17-40mm f/4L USM

Has a consant aperture Yes vs No
Help
Constant aperture lenses offer the same aperture at all focal lengths
More magnification 1:4 (0.2x) vs 1:6.7 (0.1x)
Help
Take macro shots with subjects around 70% larger in your photo
Slightly better telephoto 40 mm vs 20 mm
Help
2x more reach, less perspective distortion
Slightly more zoom 2.4x vs 2x
Help
Around 20% more zoom, giving you more flexibility for photos
Canon EF 17-40mm f/4L USM Learn more about
the Canon EF 17-40mm f/4L USM

similarities

Compared to lenses

Common Strengths Common Weaknesses
Focus motor Silent focus motor Help
10-20mm f/4-5.6 EX DC HSM Canon-ef:Sigma HSM
EF 17-40mm f/4L USM:Canon USM
Prime lens Both are zoom lenses Help
Typically not as sharp as prime lenses
Aperture Very narrow widest aperture size Help
f/4
Max focal length Poor telephoto Help
10-20mm f/4-5.6 EX DC HSM Canon-ef:20 mm
EF 17-40mm f/4L USM:40 mm

Compared to wide angle lenses

Common Strengths Common Weaknesses

LensHero is not aware of any interesting strengths shared by these two products.

Zoom range Poor zoom Help
10-20mm f/4-5.6 EX DC HSM Canon-ef:2x
EF 17-40mm f/4L USM:2.4x
Image stabilization No image stabilization Help
Risk of blur

competitors

Shared Competitors

Advantages

Disadvantages

Canon EF-S 10-22mm f/3.5-4.5 USM

Canon EF-S 10-22mm f/3.5-4.5 USM

Wide angle lens

$759

Wide maximum Has a higher max f/stop
Tamron 17-50mm f/2.8 XR Di II LD Canon-ef

Tamron 17-50mm f/2.8 XR Di II LD Canon-ef

Wide angle lens

$459

Aperture Has a wider aperture
Wide maximum Has a higher max f/stop
Focus motor Lacks a silent focus motor
Tokina 11-16mm f/2.8 AT-X 116 Pro DX Canon-ef

Tokina 11-16mm f/2.8 AT-X 116 Pro DX Canon-ef

Wide angle lens

$599

Aperture Has a wider aperture
Focus motor Lacks a silent focus motor
Sigma 12-24mm f/4.5-5.6 Canon-ef

Sigma 12-24mm f/4.5-5.6 Canon-ef

Wide angle lens

$859

Focus motor Lacks a silent focus motor

Sigma 10-20mm f/4-5.6 EX DC HSM Canon-ef Competitors

Advantages

Disadvantages

Tamron SP 10-24mm f/3.5-4.5 DI II Canon-ef

Tamron SP 10-24mm f/3.5-4.5 DI II Canon-ef

Wide angle lens

$499

Aperture Wider aperture
Magnification Slightly more magnification
Wide maximum Much wider aperture
Focus motor Doesn't have a silent focus motor
Tamron 18-270mm f/3.5-6.3 Di-II VC LD Macro Nikon-f

Tamron 18-270mm f/3.5-6.3 Di-II VC LD Macro Nikon-f

Travel lens

$400

Zoom range Much more zoom
Image stabilization Image stabilization
Focus motor Doesn't have a silent focus motor
Length Slightly longer
Sigma 8-16mm f/4.5-5.6 DC HSM Canon-ef

Sigma 8-16mm f/4.5-5.6 DC HSM Canon-ef

Wide angle lens

$649

Aperture Narrower aperture
Sigma 24mm f/1.8 EX DG DF Macro Pentax-k

Sigma 24mm f/1.8 EX DG DF Macro Pentax-k

Low light lens

$449

Aperture Much wider aperture
Prime lens Is a prime lens
Focus motor Doesn't have a silent focus motor
Zoom range Less zoom
Sigma 18-50mm f/2.8 EX DC HSM Macro Nikon-f

Sigma 18-50mm f/2.8 EX DC HSM Macro Nikon-f

Wide angle lens

$379

Fixed aperture Has a consant aperture
Aperture Wider aperture

Canon EF 17-40mm f/4L USM Competitors

Advantages

Disadvantages

Canon EF 16-35mm f/2.8L II USM

Canon EF 16-35mm f/2.8L II USM

Fisheye lens

$1,499 - $1,699

Fisheye Fisheye lens
Aperture Wider aperture
Lowest price More expensive
Magnification Slightly less magnification
Canon EF 24-70mm f/2.8L USM

Canon EF 24-70mm f/2.8L USM

Wide angle lens

$1,280

Aperture Wider aperture
Max focal length Slightly better telephoto
Weight Heavier
Length Slightly longer
Canon EF 24-105mm f/4L IS USM

Canon EF 24-105mm f/4L IS USM

Wide angle lens

$1,149

Image stabilization Image stabilization
Zoom range More zoom
Lowest price Slightly more expensive
Weight Slightly heavier
Canon EF-S 17-55mm f/2.8 IS USM

Canon EF-S 17-55mm f/2.8 IS USM

Wide angle lens

$1,059

Image stabilization Image stabilization
Aperture Wider aperture
Magnification Less magnification
Length Slightly longer
Canon 24-105mm f/4L IS USM

Canon 24-105mm f/4L IS USM

Wide angle lens

$1,059

Image stabilization Image stabilization
Zoom range More zoom
Weight Slightly heavier
Lowest price Slightly more expensive

discussion Which do you think is better?

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