Sigma
70-200mm f/2.8 EX DG OS HSM Pentax-k
 vs
Sigma
50-200mm f/4-5.6 DC OS HSM Pentax-k

vs

differences

Reasons to consider the Sigma 70-200mm f/2.8 EX DG OS HSM Pentax-k
Much narrower aperture f/22 vs f/5.6
Help
 At its narrowest, the 70-200mm f/2.8 EX DG OS HSM Pentax-k goes 3.9 f-stops narrower
Has a consant aperture Yes vs No
Help
 Constant aperture lenses offer the same aperture at all focal lengths
Wider aperture f/2.8 vs f/4
Help
 At its widest, the 70-200mm f/2.8 EX DG OS HSM Pentax-k captures slightly more light, 1 f-stop
Sigma 70-200mm f/2.8 EX DG OS HSM Pentax-k Learn more about
the Sigma 70-200mm f/2.8 EX DG OS HSM Pentax-k

Reasons to consider the Sigma 50-200mm f/4-5.6 DC OS HSM Pentax-k
Cheaper $159.00 vs $1,699.00
Help
 The best price we've seen is $1,540 cheaper (10.7x less)
More zoom 4x vs 2.9x
Help
 40% more zoom, giving you more flexibility for photos
More magnification 1:4.5 (0.2x) vs 1:8 (0.1x)
Help
 Take macro shots with subjects around 80% larger in your photo
Slightly better wide angle 50 mm vs 70 mm
Help
 Around 30% better wide angle
Sigma 50-200mm f/4-5.6 DC OS HSM Pentax-k Learn more about
the Sigma 50-200mm f/4-5.6 DC OS HSM Pentax-k

similarities

Compared to lenses

Common Strengths Common Weaknesses
Focus motor Silent focus motor Help
Silent and fast
Image stabilization Good image stabilization Help
Sigma OS
Prime lens Both are zoom lenses Help
Typically not as sharp as prime lenses

Compared to wildlife lenses

Common Strengths Common Weaknesses
Min focal length Good wide-angle Help
70-200mm f/2.8 EX DG OS HSM Pentax-k:70 mm
50-200mm f/4-5.6 DC OS HSM Pentax-k:50 mm
Max focal length Poor telephoto Help
200 mm

competitors

Shared Competitors

Advantages

Disadvantages
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 Is lighter
Aperture Has a narrower aperture
Image stabilization Doesn't have image stabilization
Compare the SMC DA 50-200mm f/4-5.6 ED WR vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Compare the SMC DA 50-200mm f/4-5.6 ED WR vs the 50-200mm f/4-5.6 DC 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
Max focal length Has a slightly shorter telephoto lens
Weight Is lighter
Aperture Has a narrower aperture
Image stabilization Doesn't have image stabilization
Compare the SMC DA 55-300mm f/4-5.8 ED vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Compare the SMC DA 55-300mm f/4-5.8 ED vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k
Sigma 70-200mm f/2.8 II EX DG APO Macro HSM Pentax-k

Sigma 70-200mm f/2.8 II EX DG APO Macro HSM Pentax-k

Sports lens

$799
Image stabilization Doesn't have image stabilization
Length Is longer
Compare the 70-200mm f/2.8 II EX DG APO Macro HSM Pentax-k vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Compare the 70-200mm f/2.8 II EX DG APO Macro HSM Pentax-k vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k
Sigma 70-300mm f/4-5.6 APO DG Macro Pentax-k

Sigma 70-300mm f/4-5.6 APO DG Macro Pentax-k

Macro lens

$209
Max focal length Has a slightly shorter telephoto lens
Magnification Has better macro
Aperture Has a narrower aperture
Image stabilization Doesn't have image stabilization
Compare the 70-300mm f/4-5.6 APO DG Macro Pentax-k vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Compare the 70-300mm f/4-5.6 APO DG Macro Pentax-k vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k
Sigma 18-200mm f/3.5-6.3 II DC OS Pentax-k

Sigma 18-200mm f/3.5-6.3 II DC OS Pentax-k

Travel lens

$499
Zoom range Has way more large zoom range
Aperture Has a narrower aperture
Focus motor Lacks a silent focus motor
Compare the 18-200mm f/3.5-6.3 II DC OS Pentax-k vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Compare the 18-200mm f/3.5-6.3 II DC OS Pentax-k vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k
Sigma 70-300mm f/4-5.6 DG Macro Pentax-k

Sigma 70-300mm f/4-5.6 DG Macro Pentax-k

Macro lens

$159
Max focal length Has a slightly shorter telephoto lens
Magnification Has better macro
Aperture Has a narrower aperture
Image stabilization Doesn't have image stabilization
Compare the 70-300mm f/4-5.6 DG Macro Pentax-k vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Compare the 70-300mm f/4-5.6 DG Macro Pentax-k vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k
Tamron 70-300mm f/4-5.6 Di LD Macro Pentax-k

Tamron 70-300mm f/4-5.6 Di LD Macro Pentax-k

Macro lens

$165
Max focal length Has a slightly shorter telephoto lens
Magnification Has better macro
Aperture Has a narrower aperture
Image stabilization Doesn't have image stabilization
Compare the 70-300mm f/4-5.6 Di LD Macro Pentax-k vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Compare the 70-300mm f/4-5.6 Di LD Macro Pentax-k vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k

Sigma 70-200mm f/2.8 EX DG OS HSM Pentax-k Competitors

Advantages

Disadvantages
Pentax SMC 60-250mm f/4 ED DA* SDM

Pentax SMC 60-250mm f/4 ED DA* SDM

Wildlife lens

$1,397
Wide maximum Significantly narrower aperture
Zoom range More zoom
Image stabilization No image stabilization
Aperture Narrower aperture
Compare the SMC 60-250mm f/4 ED DA* SDM vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Tamron 70-200mm f/2.8 Di LD Macro Pentax-k

Tamron 70-200mm f/2.8 Di LD Macro Pentax-k

Sports lens

$729
Wide maximum Significantly narrower aperture
Magnification More magnification
Focus motor Doesn't have a silent focus motor
Image stabilization No image stabilization
Compare the 70-200mm f/2.8 Di LD Macro Pentax-k vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Tamron 70-200mm f/2.8 Di LD Macro Nikon-f

Tamron 70-200mm f/2.8 Di LD Macro Nikon-f

Sports lens

$769
Wide maximum Significantly narrower aperture
Magnification More magnification
Focus motor Doesn't have a silent focus motor
Image stabilization No image stabilization
Compare the 70-200mm f/2.8 Di LD Macro Nikon-f vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Canon EF 135mm f/2.8 Soft Focus

Canon EF 135mm f/2.8 Soft Focus

Sports lens

$489
Prime lens Is a prime lens
Wide maximum Significantly narrower aperture
Focus motor Doesn't have a silent focus motor
Image stabilization No image stabilization
Compare the EF 135mm f/2.8 Soft Focus vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k
Sigma 70-300mm f/4-5.6 DG Macro Nikon-f

Sigma 70-300mm f/4-5.6 DG Macro Nikon-f

Macro lens

$159
Magnification Significantly more magnification
Max focal length Better telephoto
Fixed aperture Has a variable aperture
Focus motor Doesn't have a silent focus motor
Compare the 70-300mm f/4-5.6 DG Macro Nikon-f vs the 70-200mm f/2.8 EX DG OS HSM Pentax-k

Sigma 50-200mm f/4-5.6 DC OS HSM Pentax-k Competitors

Advantages

Disadvantages
Sigma 70-300mm f/4-5.6 APO DG Macro

Sigma 70-300mm f/4-5.6 APO DG Macro

Macro lens

$199
Wide maximum Much narrower aperture
Magnification More magnification
Focus motor Doesn't have a silent focus motor
Image stabilization No image stabilization
Compare the 70-300mm f/4-5.6 APO DG Macro vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k
Sigma 18-200mm f/3.5-6.3 DC Pentax-k

Sigma 18-200mm f/3.5-6.3 DC Pentax-k

Travel lens

$249
Zoom range Much more zoom
Wide maximum Much narrower aperture
Focus motor Doesn't have a silent focus motor
Image stabilization No image stabilization
Compare the 18-200mm f/3.5-6.3 DC Pentax-k vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k
Sigma 180mm f/3.5 EX DG APO Macro IF HSM Canon-ef

Sigma 180mm f/3.5 EX DG APO Macro IF HSM Canon-ef

Macro lens

$699
Wide maximum Much narrower aperture
Magnification Much more magnification
Image stabilization No image stabilization
Min focal length Significantly worse wide angle
Compare the 180mm f/3.5 EX DG APO Macro IF HSM Canon-ef vs the 50-200mm f/4-5.6 DC OS HSM Pentax-k

discussion Which do you think is better?

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