Telephoto focal length
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Lens category
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Lens mount
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Type
A telephoto shot of a lion

Pentax K Prime Wildlife lenses that have a 300mm or longer focal length

#1

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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Quite short
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183 mm
 
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Small diameter
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84 mm
 
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Very light
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1.1 kg
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Max focal length 300 mm
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Weight 1.1 kg
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Length 183 mm
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Diameter 84 mm
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Min focal length 300 mm
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Auto focus Yes
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Aperture f/4
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Zoom range 1x
#2

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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Length 522 mm
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Diameter 130 mm
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Min focal length 560 mm
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Auto focus Yes
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Aperture f/5.6
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Zoom range 1x
#3

Sigma 300mm f/2.8 EX DG Pentax K

Sigma 300mm f/2.8 EX DG Pentax K

"It is fast in auto focus and I didn't miss a shot when trying to photograph snow geese!" bhphotovideo.com

 
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Quite short
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213 mm
 
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Wide aperture
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f/2.8
 
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Wide angle lens
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300 mm
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Max focal length 300 mm
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Weight 2.4 kg
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Length 213 mm
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Diameter 119 mm
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Min focal length 300 mm
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Auto focus Yes
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Aperture f/2.8
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Zoom range 1x
#4

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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Weight 3.1 kg
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Length 351 mm
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Diameter 122 mm
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Min focal length 500 mm
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Auto focus Yes
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Aperture f/4.5
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Zoom range 1x