Tamron
28-300mm f/3.5-6.3 XR Di Pentax-k
 vs
Sigma
17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

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
Help
 More than 2.5x more zoom, giving you more flexibility for photos
Significantly better telephoto 300 mm vs 70 mm
Help
 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
Help
 Focuses quickly and silently
Image stabilization Sigma OS vs None
Help
 Helps eliminate blur caused by small camera movements
Wider aperture f/2.8 vs f/3.5
Help
 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
Compare the SMC DA 18-135mm f/3.5-5.6 ED AL DC WR vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
Compare the SMC DA 18-135mm f/3.5-5.6 ED AL DC WR vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the SMC DA 55-300mm f/4-5.8 ED vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
Compare the SMC DA 55-300mm f/4-5.8 ED vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the 18-200mm f/3.5-6.3 XR Di-II Macro Pentax-k vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
Compare the 18-200mm f/3.5-6.3 XR Di-II Macro Pentax-k vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the 18-250mm f/3.5-6.3 DC OS HSM Pentax-k vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
Compare the 18-250mm f/3.5-6.3 DC OS HSM Pentax-k vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the SMC DA 18-55mm f/3.5-5.6 AL II vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
Compare the SMC DA 18-55mm f/3.5-5.6 AL II vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the SMC DA 18-55mm f/3.5-5.6 AL WR vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
Compare the SMC DA 18-55mm f/3.5-5.6 AL WR vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

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
Compare the 28-300mm f/3.5-6.3 DG Macro Pentax-k vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
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
Compare the 18-250mm f/3.5-6.3 Di-II LD IF Macro Nikon-f vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
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
Compare the SMC DA 50-200mm f/4-5.6 ED WR vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
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
Compare the M.Zuiko 75-300mm f/4.8-6.7 ED LNS vs the 28-300mm f/3.5-6.3 XR Di Pentax-k
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
Compare the 28-300mm f/3.5-6.3 DG Macro Nikon-f vs the 28-300mm f/3.5-6.3 XR Di Pentax-k

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
Compare the SMC DA 17-70mm f/4 AL SDM vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the SMC DA* 50-135mm f/2.8 ED SDM vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the 18-200mm f/3.5-6.3 XR Di-II Macro Nikon-f vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the 18-50mm f/2.8 EX DC HSM Macro Nikon-f vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k
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
Compare the SMC DA 16-45mm f/4 ED AL vs the 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

discussion Which do you think is better?

Speech is free, but discussion at LensHero is moderated! Please discuss your opinion of these lenses here, and discuss feedback for LensHero at our support community.

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