vs

differences

Reasons to consider the Tamron 28-300mm f/3.5-6.3 XR Di Pentax-k

Much more zoom 10.7x vs 4.1x
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More than 2.5x more zoom, giving you more flexibility for photos
Significantly better telephoto 300 mm vs 70 mm
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Around 4.5x more reach, less perspective distortion
Tamron 28-300mm f/3.5-6.3 XR Di Pentax-k Learn more about
the Tamron 28-300mm f/3.5-6.3 XR Di Pentax-k

Reasons to consider the Sigma 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

Has a silent focus motor Sigma HSM vs None
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Focuses quickly and silently
Image stabilization Sigma OS vs None
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Helps eliminate blur caused by small camera movements
Wider aperture f/2.8 vs f/3.5
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At its widest, the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k captures slightly more light, 0.6 f-stops
Slightly better wide angle 17 mm vs 28 mm
Help
Around 40% better wide angle
Sigma 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k Learn more about
the Sigma 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

similarities

Compared to lenses

Common Strengths Common Weaknesses

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

Prime lens Both are zoom lenses Help
Typically not as sharp as prime lenses
Fixed aperture Both are variable aperture lenses Help
Narrower aperture at longer focal lengths

Compared to portrait lenses

Common Strengths Common Weaknesses

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

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

competitors

Shared Competitors

Advantages

Disadvantages

Pentax SMC  DA 18-135mm f/3.5-5.6 ED AL DC WR

Pentax SMC DA 18-135mm f/3.5-5.6 ED AL DC WR

Travel lens

$497

Wide maximum Has a higher max f/stop
Aperture Has a narrower aperture
Pentax SMC  DA 55-300mm f/4-5.8 ED

Pentax SMC DA 55-300mm f/4-5.8 ED

Wildlife lens

$397

Aperture Has a narrower aperture
Tamron 18-200mm f/3.5-6.3 XR Di-II Macro Pentax-k

Tamron 18-200mm f/3.5-6.3 XR Di-II Macro Pentax-k

Travel lens

$290

Aperture Has a narrower aperture
Sigma 18-250mm f/3.5-6.3 DC OS HSM Pentax-k

Sigma 18-250mm f/3.5-6.3 DC OS HSM Pentax-k

Travel lens

$479

Zoom range Has significantly large zoom range
Aperture Has a narrower aperture
Pentax SMC  DA 18-55mm f/3.5-5.6 AL II

Pentax SMC DA 18-55mm f/3.5-5.6 AL II

Wide angle lens

Aperture Has a narrower aperture
Pentax SMC DA 18-55mm f/3.5-5.6 AL WR

Pentax SMC DA 18-55mm f/3.5-5.6 AL WR

Wide angle lens

$197

Aperture Has a narrower aperture

Tamron 28-300mm f/3.5-6.3 XR Di Pentax-k Competitors

Advantages

Disadvantages

Sigma 28-300mm f/3.5-6.3 DG Macro Pentax-k

Sigma 28-300mm f/3.5-6.3 DG Macro Pentax-k

Wildlife lens

$299

Tamron 18-250mm f/3.5-6.3 Di-II LD IF Macro Nikon-f

Tamron 18-250mm f/3.5-6.3 Di-II LD IF Macro Nikon-f

Travel lens

$279

Zoom range More zoom
Max focal length Worse telephoto
Magnification Slightly less magnification
Pentax SMC  DA 50-200mm f/4-5.6 ED WR

Pentax SMC DA 50-200mm f/4-5.6 ED WR

Wildlife lens

$197

Weight Slightly lighter
Zoom range Much less zoom
Max focal length Worse telephoto
Olympus M.Zuiko 75-300mm f/4.8-6.7 ED LNS

Olympus M.Zuiko 75-300mm f/4.8-6.7 ED LNS

Wildlife lens

$549

Zoom range Much less zoom
Aperture Significantly narrower aperture
Sigma 28-300mm f/3.5-6.3 DG Macro Nikon-f

Sigma 28-300mm f/3.5-6.3 DG Macro Nikon-f

Travel lens

$299

Sigma 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k Competitors

Advantages

Disadvantages

Pentax SMC  DA 17-70mm f/4 AL SDM

Pentax SMC DA 17-70mm f/4 AL SDM

Wide angle lens

$597

Fixed aperture Has a consant aperture
Image stabilization No image stabilization
Aperture Narrower aperture
Pentax SMC  DA* 50-135mm f/2.8 ED SDM

Pentax SMC DA* 50-135mm f/2.8 ED SDM

Sports lens

$1,397

Fixed aperture Has a consant aperture
Max focal length Better telephoto
Image stabilization No image stabilization
Magnification Less magnification
Tamron 18-200mm f/3.5-6.3 XR Di-II Macro Nikon-f

Tamron 18-200mm f/3.5-6.3 XR Di-II Macro Nikon-f

Travel lens

$199

Zoom range Much more zoom
Max focal length Better telephoto
Focus motor Doesn't have a silent focus motor
Image stabilization No image stabilization
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
Image stabilization No image stabilization
Zoom range Less zoom
Pentax SMC  DA 16-45mm f/4 ED AL

Pentax SMC DA 16-45mm f/4 ED AL

Wide angle lens

$600

Fixed aperture Has a consant aperture
Weight Slightly lighter
Focus motor Doesn't have a silent focus motor
Image stabilization No image stabilization

discussion Which do you think is better?

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