Telephoto focal length
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Lens category
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Lens mount
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Focus motor
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Pentax K Lenses that have a generic focus motor and 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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Great zoom range
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7.5x
 
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Wide angle lens
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18 mm
 
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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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Focus motor Generic motor
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Auto focus Yes
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Length 76 mm
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Weight 405 g
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Min focal length 18 mm
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Fixed aperture No
#2

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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Wide angle lens
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55 mm
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Max focal length 300 mm
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Aperture f/4
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Focus motor Generic motor
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Auto focus Yes
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Length 112 mm
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Weight 466 g
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Min focal length 55 mm
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Fixed aperture No
#3

Pentax SMC DA FA 100mm f/2.8 WR Macro

Pentax SMC  DA FA 100mm f/2.8 WR Macro

"It is light weight, very smooth, very sharp images" bhphotovideo.com

 
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Quite short
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64 mm
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Max focal length 100 mm
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Aperture f/2.8
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Focus motor Generic motor
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Auto focus Yes
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Length 64 mm
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Weight 340 g
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Min focal length 100 mm
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Fixed aperture n/a
#4

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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Focus motor Generic motor
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Auto focus Yes
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Length 242 mm
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Weight 2 kg
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Min focal length 150 mm
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Fixed aperture No
#5

Pentax SMC DA 560mm f/5.6 ED AW

Pentax SMC DA 560mm f/5.6 ED AW
 
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Great telephoto lens
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560 mm
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Max focal length 560 mm
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Aperture f/5.6
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Focus motor Generic motor
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Auto focus Yes
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Length 522 mm
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Weight 3 kg
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Min focal length 560 mm
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Fixed aperture n/a
#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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Wide angle lens
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50 mm
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Max focal length 200 mm
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Aperture f/4
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Focus motor Generic motor
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Auto focus Yes
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Length 79 mm
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Weight 286 g
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Min focal length 50 mm
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Fixed aperture No
#7

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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Max focal length 200 mm
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Aperture f/2.8
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Focus motor Generic motor
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Auto focus Yes
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Length 203 mm
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Weight 1.8 kg
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Min focal length 70 mm
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Fixed aperture Yes
#8

Rokinon 135mm f/2 ED UMC Pentax K

Rokinon 135mm f/2 ED UMC Pentax K
 
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Wide aperture
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f/2
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Max focal length 135 mm
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Aperture f/2
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Focus motor Generic motor
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Auto focus No
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Length n/a
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Weight 0.8 kg
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Min focal length 135 mm
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Fixed aperture n/a
#9

Samyang 135mm f/2 ED UMC Pentax K

Samyang 135mm f/2 ED UMC Pentax K
 
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Wide aperture
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f/2
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Max focal length 135 mm
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Aperture f/2
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Focus motor Generic motor
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Auto focus No
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Length 121 mm
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Weight 0.8 kg
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Min focal length 135 mm
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Fixed aperture n/a
#10

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

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

"I like to take shots from far away so people will act normal when they see a camera. It gets the photos I want and its light weight. " bhphotovideo.com

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Max focal length 300 mm
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Aperture f/4
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Focus motor Generic motor
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Auto focus Yes
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Length 120 mm
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Weight 0.6 kg
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Min focal length 70 mm
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Fixed aperture No