Sigma
10-20mm f/3.5 EX DC HSM Canon-ef
 vs
Pentax SMC
DA 10-17mm f/3.5-4.5 ED

vs

differences

Reasons to consider the Sigma 10-20mm f/3.5 EX DC HSM Canon-ef
Has a consant aperture Yes vs No
Help
 Constant aperture lenses offer the same aperture at all focal lengths
Has a silent focus motor Sigma HSM vs None
Help
 Focuses quickly and silently
Sigma 10-20mm f/3.5 EX DC HSM Canon-ef Learn more about
the Sigma 10-20mm f/3.5 EX DC HSM Canon-ef

Reasons to consider the Pentax DA 10-17mm f/3.5-4.5 ED
Fisheye lens Yes vs No
Help
 Fisheye lenses take extremely wide 'circular' looking images
Much narrower aperture f/22 vs f/3.5
Help
 At its narrowest, the DA 10-17mm f/3.5-4.5 ED goes 5.3 f-stops narrower
More magnification 1:4.3 (0.2x) vs 1:6.6 (0.2x)
Help
 Take macro shots with subjects more than 50% larger in your photo
Slightly lighter 320 g vs 0.5 kg
Help
 Around 40% lighter
Pentax SMC DA 10-17mm f/3.5-4.5 ED Learn more about
the Pentax DA 10-17mm f/3.5-4.5 ED

similarities

Compared to lenses

Common Strengths Common Weaknesses
Min focal length Good wide-angle Help
10 mm
Prime lens Both are zoom lenses Help
Typically not as sharp as prime lenses
Max focal length Poor telephoto Help
10-20mm f/3.5 EX DC HSM Canon-ef:20 mm
DA 10-17mm f/3.5-4.5 ED:17 mm

competitors

Shared Competitors

Advantages

Disadvantages
Rokinon 14mm f/2.8 IF ED UMC Canon-ef

Rokinon 14mm f/2.8 IF ED UMC Canon-ef

Wide angle lens

$349
Aperture Has a wider aperture
Prime lens Is a fixed focal length prime lens
Auto focus Lacks autofocus
Compare the 14mm f/2.8 IF ED UMC Canon-ef vs the 10-20mm f/3.5 EX DC HSM Canon-ef
Compare the 14mm f/2.8 IF ED UMC Canon-ef vs the SMC DA 10-17mm f/3.5-4.5 ED

Sigma 10-20mm f/3.5 EX DC HSM Canon-ef 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 Much narrower aperture
Weight Slightly lighter
Fixed aperture Has a variable aperture
Compare the EF-S 10-22mm f/3.5-4.5 USM vs the 10-20mm f/3.5 EX DC HSM Canon-ef
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

$569
Wide maximum Much narrower aperture
Aperture Wider aperture
Focus motor Doesn't have a silent focus motor
Magnification Slightly less magnification
Compare the 11-16mm f/2.8 AT-X 116 Pro DX Canon-ef vs the 10-20mm f/3.5 EX DC HSM Canon-ef
Sigma 8-16mm f/4.5-5.6 DC HSM Nikon-f

Sigma 8-16mm f/4.5-5.6 DC HSM Nikon-f

Wide angle lens

$649
Wide maximum Much narrower aperture
Fixed aperture Has a variable aperture
Aperture Narrower aperture
Compare the 8-16mm f/4.5-5.6 DC HSM Nikon-f vs the 10-20mm f/3.5 EX DC HSM Canon-ef
Sigma 10-20mm f/4-5.6 EX DC HSM Canon-ef

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

Wide angle lens

$479
Wide maximum Much narrower aperture
Fixed aperture Has a variable aperture
Aperture Narrower aperture
Compare the 10-20mm f/4-5.6 EX DC HSM Canon-ef vs the 10-20mm f/3.5 EX DC HSM Canon-ef
Canon EF 17-40mm f/4L USM

Canon EF 17-40mm f/4L USM

Wide angle lens

$739
Wide maximum Much narrower aperture
Magnification More magnification
Aperture Narrower aperture
Compare the EF 17-40mm f/4L USM vs the 10-20mm f/3.5 EX DC HSM Canon-ef

Pentax SMC DA 10-17mm f/3.5-4.5 ED Competitors

Advantages

Disadvantages
Fujifilm XF 14mm f/2.8 R

Fujifilm XF 14mm f/2.8 R

Lens
Prime lens Is a prime lens
Aperture Wider aperture
Fisheye Not a fisheye
Magnification Less magnification
Compare the XF 14mm f/2.8 R vs the SMC DA 10-17mm f/3.5-4.5 ED
Pentax SMC DA 12-24mm f/4 ED AL

Pentax SMC DA 12-24mm f/4 ED AL

Wide angle lens

$897
Fixed aperture Has a consant aperture
Fisheye Not a fisheye
Aperture Narrower aperture
Compare the SMC DA 12-24mm f/4 ED AL vs the SMC DA 10-17mm f/3.5-4.5 ED
Sigma 10mm f/2.8 EX DC HSM Nikon-f

Sigma 10mm f/2.8 EX DC HSM Nikon-f

Fisheye lens

$649
Focus motor Has a silent focus motor
Prime lens Is a prime lens
Zoom range Slightly less zoom
Length Slightly longer
Compare the 10mm f/2.8 EX DC HSM Nikon-f vs the SMC DA 10-17mm f/3.5-4.5 ED
Leica Tri-Elmar-Mf/16-18-21mm f/4

Leica Tri-Elmar-Mf/16-18-21mm f/4

Wide angle lens

$5,350
Fixed aperture Has a consant aperture
Diameter Slightly smaller diameter
Fisheye Not a fisheye
Lowest price Significantly more expensive
Compare the Tri-Elmar-Mf/16-18-21mm f/4 vs the SMC DA 10-17mm f/3.5-4.5 ED
Rokinon 7.5mm .5 CS /

Rokinon 7.5mm .5 CS /

Fisheye lens

$299
Prime lens Is a prime lens
Lowest price Slightly cheaper
Auto focus Auto focus
Zoom range Slightly less zoom
Compare the 7.5mm .5 CS / vs the SMC DA 10-17mm f/3.5-4.5 ED

discussion Which do you think is better?

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