Telephoto focal length
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Lens category
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Lens mount
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Pentax K Lenses that have a 300mm or longer focal length

#1

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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Weight 3 kg
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Min focal length 560 mm
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Diameter 130 mm
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Length 522 mm
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Image stabilization None
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Zoom range 1x
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Aperture f/5.6
#2

Pentax SMC DA* 300mm f/4 ED SDM

Pentax SMC  DA* 300mm f/4 ED SDM

"Stellar performer. Very sharp, and works well with in-body stabilisation, which is more noticable/effective at this focal length. Suprisingly good bokeh! This has now become my default lens bushwalking, with a shorter macro and wide prime in the bag. Very versatile thanks to close minimum focus distance. Not as big as imagined. About as heavy as expected (not light, but probably good for this class of lens). Overall GREAT and well worth the investment." bhphotovideo.com

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Max focal length 300 mm
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Weight 1.1 kg
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Min focal length 300 mm
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Diameter 84 mm
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Length 183 mm
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Image stabilization None
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Zoom range 1x
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Aperture f/4
#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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Wide angle lens
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55 mm
 
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Quite short
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112 mm
 
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Very light
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466 g
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Max focal length 300 mm
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Weight 466 g
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Min focal length 55 mm
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Diameter 71 mm
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Length 112 mm
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Image stabilization None
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Zoom range 5.5x
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Aperture f/4
#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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Max focal length 450 mm
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Weight 2 kg
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Min focal length 150 mm
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Diameter 95 mm
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Length 242 mm
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Image stabilization None
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Zoom range 3x
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Aperture f/4.5
#5

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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Wide angle lens
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18 mm
 
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Quite short
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102 mm
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Max focal length 300 mm
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Weight 0.6 kg
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Min focal length 18 mm
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Diameter 79 mm
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Length 102 mm
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Image stabilization None
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Zoom range 16.7x
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Aperture f/3.5
#6

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

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

"toolk a little getting used to but love it" bhphotovideo.com

 
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Wide angle lens
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70 mm
 
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Quite short
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120 mm
 
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Very light
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0.5 kg
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Max focal length 300 mm
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Weight 0.5 kg
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Min focal length 70 mm
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Diameter 77 mm
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Length 120 mm
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Image stabilization None
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Zoom range 4.3x
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Aperture f/4
#7

Sigma 500mm f/4.5 EX DG APO Pentax K

Sigma 500mm f/4.5 EX DG APO Pentax K
 
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Great telephoto lens
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500 mm
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Max focal length 500 mm
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Weight 3.1 kg
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Min focal length 500 mm
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Diameter 122 mm
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Length 351 mm
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Image stabilization None
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Zoom range 1x
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Aperture f/4.5
#8

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

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

"Great lens, very durable and inexpensive! You can't beat this with a stick! Don't hesitate to buy!" bhphotovideo.com

 
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Quite short
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117 mm
 
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Wide angle lens
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70 mm
 
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Very light
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435 g
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Max focal length 300 mm
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Weight 435 g
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Min focal length 70 mm
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Diameter 76 mm
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Length 117 mm
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Image stabilization None
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Zoom range 4.3x
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Aperture f/4
#9

Sigma 120-400mm f/4.5-5.6 DG APO OS HSM Pentax K

Sigma 120-400mm f/4.5-5.6 DG APO OS HSM Pentax K
 
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More advanced image stabilization
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Sigma OS
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Max focal length 400 mm
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Weight 1.8 kg
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Min focal length 120 mm
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Diameter 91 mm
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Length 203 mm
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Image stabilization Sigma OS
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Zoom range 3.3x
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Aperture f/4.5
#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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More advanced image stabilization
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Sigma OS
 
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Great telephoto lens
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500 mm
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Max focal length 500 mm
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Weight 1.9 kg
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Min focal length 150 mm
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Diameter 94 mm
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Length 252 mm
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Image stabilization Sigma OS
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Zoom range 3.3x
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Aperture f/5