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 500mm 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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Max focal length 560 mm
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Image stabilization None
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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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Weight 3 kg
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Zoom range 1x
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Aperture f/5.6
#2

Sigma 500mm f/4.5 EX DG APO Pentax K

Sigma 500mm f/4.5 EX DG APO Pentax K
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Max focal length 500 mm
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Image stabilization None
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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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Weight 3.1 kg
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Zoom range 1x
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Aperture f/4.5
#3

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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Wide angle lens
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150 mm
 
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Quite short
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252 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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Image stabilization Sigma OS
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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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Weight 1.9 kg
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Zoom range 3.3x
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Aperture f/5
#4

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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Wide angle lens
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50 mm
 
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Great zoom range
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10x
 
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Quite short
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218 mm
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Max focal length 500 mm
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Image stabilization Sigma OS
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Min focal length 50 mm
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Diameter 104 mm
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Length 218 mm
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Weight 2 kg
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Zoom range 10x
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Aperture f/4.5