differences

Reasons to consider the Tamron 17-50mm f/2.8 XR Di II LD Canon EF

Significantly narrower aperture f/32 vs f/22
Help
At its narrowest, the 17-50mm f/2.8 XR Di II LD Canon EF goes 1.1 f-stops narrower
Smaller diameter 74 mm vs 84 mm
Help
More than 10% smaller lens at the end
Slightly shorter 81 mm vs 91 mm
Help
More than 10% shorter
Slightly lighter 430 g vs 0.6 kg
Help
More than 20% lighter
Tamron 17-50mm f/2.8 XR Di II LD Canon EF Learn more about
the Tamron 17-50mm f/2.8 XR Di II LD Canon EF

Reasons to consider the Sigma 17-50mm f/2.8 EX DC OS HSM Canon EF

Image stabilization Sigma OS vs None
Help
Helps eliminate blur caused by small camera movements
Sigma 17-50mm f/2.8 EX DC OS HSM Canon EF Learn more about
the Sigma 17-50mm f/2.8 EX DC OS HSM Canon EF

similarities

Compared to digital camera lenses

Common Strengths Common Weaknesses
Fixed aperture Constant aperture lenses Help
The same maximum aperture at all focal lengths
Auto focus Auto focus Help
Easier to use
Prime lens Both are zoom lenses Help
Typically not as sharp as prime lenses

Compared to digital camera lenses

Common Strengths Common Weaknesses
Wide minimum Wide aperture Help
17-50mm f/2.8 XR Di II LD Canon EFf/32
17-50mm f/2.8 EX DC OS HSM Canon EFf/22

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

competitors

Sigma 17-50mm f/2.8 EX DC OS HSM Canon EF Competitors

Tamron SP 17-50mm f/2.8 XR Di-II VC LD Canon EF

Tamron SP 17-50mm f/2.8 XR Di-II VC LD Canon EF

Wide angle lens

$270 - $299

Wide minimum Significantly narrower aperture
Diameter Slightly smaller diameter
Canon EF-S 17-55mm f/2.8 IS USM

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

Wide angle lens

$760 - $829

Image stabilization Better image stabilization
Zoom range Slightly more zoom
Lowest price More expensive
Canon EF-S 15-85mm f/3.5-5.6 IS USM

Canon EF-S 15-85mm f/3.5-5.6 IS USM

Travel lens

$520 - $799

Zoom range More zoom
Image stabilization Better image stabilization
Fixed aperture Has a variable aperture

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

Canon EF 85mm f/1.8 USM

Canon EF 85mm f/1.8 USM

Low light lens

$340 - $719

Prime lens Is a prime lens
Aperture Wider aperture
Wide minimum Significantly wider aperture
Tamron SP 17-50mm f/2.8 XR Di-II VC LD Canon EF

Tamron SP 17-50mm f/2.8 XR Di-II VC LD Canon EF

Wide angle lens

$270 - $299

Image stabilization Image stabilization
Diameter Slightly larger diameter
Tamron 28-75mm f/2.8 XR Di Canon EF

Tamron 28-75mm f/2.8 XR Di Canon EF

Wide angle lens

$297 - $499

Max focal length Slightly better telephoto
Length Slightly longer

discussion Which do you think is better?

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