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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Weight 405 g
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Zoom range 7.5x
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Image stabilization None
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Fixed aperture No
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Aperture f/3.5
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Length 76 mm
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Diameter 74 mm
#2

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

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

"This lens is a great fast focusing, sharp lens. I have been using this lens to take bird photos for the last few weeks and it does a marvelous job. The greatest advantage of this zoom is its size. It breaks down to being only a 1/4 inch longer than my 18-55 zoom kit lens. I also like that is allows manual focus with AF on." 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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Weight 286 g
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Zoom range 4x
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Image stabilization None
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Fixed aperture No
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Aperture f/4
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Length 79 mm
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Diameter 69 mm
#3

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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Weight 2 kg
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Zoom range 3x
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Image stabilization None
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Fixed aperture No
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Aperture f/4.5
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Length 242 mm
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Diameter 95 mm
#4

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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Weight 1.8 kg
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Zoom range 2.9x
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Image stabilization None
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Fixed aperture Yes
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Aperture f/2.8
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Length 203 mm
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Diameter 92 mm
#5

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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Weight 1 kg
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Zoom range 4.2x
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Image stabilization None
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Fixed aperture Yes
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Aperture f/4
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Length 168 mm
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Diameter 81 mm
#6

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

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

"The build quality seems top notch, no play in the focus or zoom rings at all, and very smooth action of both." 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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Weight 0.7 kg
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Zoom range 2.7x
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Image stabilization None
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Fixed aperture Yes
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Aperture f/2.8
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Length 137 mm
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Diameter 76 mm
#7

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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Weight 466 g
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Zoom range 5.5x
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Image stabilization None
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Fixed aperture No
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Aperture f/4
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Length 112 mm
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Diameter 71 mm
#8

Sigma 18-300mm f/3.5-6.3 DC MACRO HSM Contemporary Pentax K

Sigma 18-300mm f/3.5-6.3 DC MACRO HSM Contemporary Pentax K
 
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Great zoom range
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16.7x
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Max focal length 300 mm
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Weight 0.6 kg
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Zoom range 16.7x
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Image stabilization None
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Fixed aperture No
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Aperture f/3.5
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Length 102 mm
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Diameter 79 mm
#9

Sigma 50-500mm f/4.5-6.3 APO DG OS HSM Pentax K

Sigma 50-500mm f/4.5-6.3 APO DG OS HSM 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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Great zoom range
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10x
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Max focal length 500 mm
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Weight 2 kg
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Zoom range 10x
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Image stabilization Sigma OS
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Fixed aperture No
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Aperture f/4.5
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Length 218 mm
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Diameter 104 mm
#10

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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Weight 1.1 kg
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Zoom range 2.9x
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Image stabilization None
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Fixed aperture Yes
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Aperture f/2.8
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Length 193 mm
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Diameter 89 mm