Telephoto focal length
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Lens category
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Lens mount
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Type

Pentax K Zoom Lenses that have a 100mm or longer focal length

#1

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
 
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Quite short
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76 mm
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Max focal length 135 mm
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Aperture f/3.5
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Zoom range 7.5x
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Weight 405 g
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Fixed aperture No
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Image stabilization None
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Length 76 mm
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Min focal length 18 mm
#2

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

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

"I've used this lens now for about 1200 shots of lacrosse games taken in the evening/night under the lights, bright sun and cloudy days. Great resolution when the focus is spot on." bhphotovideo.com

 
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Fixed aperture
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The same maximum aperture at all focal lengths
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Max focal length 250 mm
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Aperture f/4
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Zoom range 4.2x
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Weight 1 kg
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Fixed aperture Yes
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Image stabilization None
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Length 168 mm
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Min focal length 60 mm
#3

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

Pentax SMC HD Pentax-DA 55-300mm f/4-5.8 ED WR
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Max focal length 300 mm
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Aperture f/4
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Zoom range 5.5x
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Weight 466 g
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Fixed aperture No
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Image stabilization None
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Length 112 mm
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Min focal length 55 mm
#4

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

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

"Great lens for taking pictures of the kids, fast, smooth zoom and I don't have to be in their face to get a shot, very sharp pictures..." bhphotovideo.com

 
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Fixed aperture
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The same maximum aperture at all focal lengths
 
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Wide aperture
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f/2.8
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Max focal length 135 mm
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Aperture f/2.8
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Zoom range 2.7x
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Weight 0.7 kg
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Fixed aperture Yes
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Image stabilization None
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Length 137 mm
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Min focal length 50 mm
#5

Pentax SMC HD D FA 150-450mm f/4.5-5.6 DC AW

Pentax SMC HD D FA 150-450mm f/4.5-5.6 DC AW
 
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Great telephoto lens
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450 mm
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Max focal length 450 mm
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Aperture f/4.5
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Zoom range 3x
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Weight 2 kg
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Fixed aperture No
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Image stabilization None
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Length 242 mm
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Min focal length 150 mm
#6

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

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

"Great lens, exactly as advertised. Easy to focus. Perfect for the camera body." bhphotovideo.com

 
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Quite short
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79 mm
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Max focal length 200 mm
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Aperture f/4
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Zoom range 4x
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Weight 286 g
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Fixed aperture No
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Image stabilization None
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Length 79 mm
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Min focal length 50 mm
#7

Pentax SMC DAA 18-270mm f/3.5-6.3 ED SDM

Pentax SMC  DAA 18-270mm f/3.5-6.3 ED SDM
 
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Great zoom range
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15x
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Max focal length 270 mm
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Aperture f/3.5
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Zoom range 15x
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Weight 453 g
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Fixed aperture No
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Image stabilization None
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Length 89 mm
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Min focal length 18 mm
#8

Pentax SMC HD D FA* 70-200mm f/2.8 ED DC AW

Pentax SMC HD D FA* 70-200mm f/2.8 ED DC AW
 
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Fixed aperture
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The same maximum aperture at all focal lengths
 
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Wide aperture
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f/2.8
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Max focal length 200 mm
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Aperture f/2.8
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Zoom range 2.9x
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Weight 1.8 kg
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Fixed aperture Yes
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Image stabilization None
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Length 203 mm
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Min focal length 70 mm
#9

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

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

"The colors are perfect, the sharpen is stupendous, the phenomenal focus and the DOF is very very beautiful." bhphotovideo.com

 
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Fixed aperture
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The same maximum aperture at all focal lengths
 
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Wide aperture
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f/2.8
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Max focal length 200 mm
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Aperture f/2.8
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Zoom range 2.9x
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Weight 1.1 kg
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Fixed aperture Yes
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Image stabilization None
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Length 193 mm
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Min focal length 70 mm
#10

Sigma 150-500mm f/5-6.3 DG OS HSM APO Pentax K

Sigma 150-500mm f/5-6.3 DG OS HSM APO Pentax K
 
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Great telephoto lens
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500 mm
 
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More advanced image stabilization
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Sigma OS
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Max focal length 500 mm
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Aperture f/5
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Zoom range 3.3x
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Weight 1.9 kg
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Fixed aperture No
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Image stabilization Sigma OS
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Length 252 mm
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Min focal length 150 mm