vs

differences

Reasons to consider the Tamron 28-75mm f/2.8 XR Di Pentax-k

Has a consant aperture Yes vs No
Help
Constant aperture lenses offer the same aperture at all focal lengths
Significantly narrower aperture f/32 vs f/22
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At its narrowest, the 28-75mm f/2.8 XR Di Pentax-k goes 1.1 f-stops narrower
Wider aperture f/2.8 vs f/3.5
Help
At its widest, the 28-75mm f/2.8 XR Di Pentax-k captures slightly more light, 0.6 f-stops
Tamron 28-75mm f/2.8 XR Di Pentax-k Learn more about
the Tamron 28-75mm f/2.8 XR Di Pentax-k

Reasons to consider the Sigma 18-250mm f/3.5-6.3 DC OS HSM Pentax-k

Much more zoom 13.9x vs 2.7x
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More than 5x more zoom, giving you more flexibility for photos
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
Significantly better telephoto 250 mm vs 75 mm
Help
Around 3.5x more reach, less perspective distortion
Slightly more magnification 1:3.4 (0.3x) vs 1:3.9 (0.3x)
Help
Take macro shots with subjects more than 10% larger in your photo
Sigma 18-250mm f/3.5-6.3 DC OS HSM Pentax-k Learn more about
the Sigma 18-250mm f/3.5-6.3 DC 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

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

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

Aperture Has a narrower aperture
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
Sigma 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

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

Wide angle lens

$449

Sigma 18-125mm f/3.8-5.6 DC OS HSM Pentax-k

Sigma 18-125mm f/3.8-5.6 DC OS HSM Pentax-k

Travel lens

$339

Aperture Has a narrower aperture
Wide maximum Has a lower max f/stop
Sigma 18-200mm f/3.5-6.3 DC OS

Sigma 18-200mm f/3.5-6.3 DC OS

Wildlife lens

$369

Aperture Has a narrower aperture
Lensbaby Composer Special Effects Fisheye Pentax-k

Lensbaby Composer Special Effects Fisheye Pentax-k

Fisheye lens

$179

Fisheye Is a fisheye lens
Pentax SMC  DA 17-70mm f/4 AL SDM

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

Wide angle lens

$597

Aperture Has a narrower aperture

Tamron 28-75mm f/2.8 XR Di Pentax-k Competitors

Advantages

Disadvantages

Tamron 90mm f/2.8 SP Di Macro Nikon-f

Tamron 90mm f/2.8 SP Di Macro Nikon-f

Macro lens

$499

Magnification Much more magnification
Prime lens Is a prime lens
Min focal length Worse wide angle
Zoom range Less zoom
Sigma 24-70mm f/2.8 IF EX DG HSM Pentax-k

Sigma 24-70mm f/2.8 IF EX DG HSM Pentax-k

Portrait lens

$899

Focus motor Has a silent focus motor
Wide maximum Significantly wider aperture
Magnification Slightly less magnification
Sigma 24-70mm f/2.8 EX DG Macro DF Pentax-k

Sigma 24-70mm f/2.8 EX DG Macro DF Pentax-k

Portrait lens

$569

Length Slightly longer
Weight Slightly heavier
Fujifilm 35mm f/1.4 XF R

Fujifilm 35mm f/1.4 XF R

Low light lens

Prime lens Is a prime lens
Aperture Significantly wider aperture
Zoom range Less zoom
Magnification Less magnification
Pentax SMC  DA 16-45mm f/4 ED AL

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

Wide angle lens

$600

Min focal length Slightly better wide angle
Weight Slightly lighter
Wide maximum Significantly wider aperture
Aperture Narrower aperture

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

Advantages

Disadvantages

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

Magnification More magnification
Max focal length Better telephoto
Zoom range Much less zoom
Focus motor Doesn't have a silent focus motor
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
Lowest price Slightly cheaper
Zoom range Much less zoom
Focus motor Doesn't have a silent focus motor
Tamron 28-300mm f/3.5-6.3 XR Di Pentax-k

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

Wildlife lens

$390

Max focal length Better telephoto
Magnification Slightly more magnification
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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