Telephoto focal length
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Wide aperture
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Lens category
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Lens mount
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Focus motor
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Type

Pentax K Zoom Lenses that have a generic focus motor, have a 300mm or longer focal length and have a f/4 or faster aperture

#1

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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Aperture f/4
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Length 112 mm
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Max focal length 300 mm
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Min focal length 55 mm
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Focus motor Generic motor
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Diameter 71 mm
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Zoom range 5.5x
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Weight 466 g
#2

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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Aperture f/4
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Length 120 mm
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Max focal length 300 mm
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Min focal length 70 mm
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Focus motor Generic motor
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Diameter 77 mm
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Zoom range 4.3x
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Weight 0.5 kg
#3

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

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

"This lens gives you a functional telephoto lens for the price. Operation is smooth and the image quality is good." bhphotovideo.com

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Aperture f/4
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Length 117 mm
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Max focal length 300 mm
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Min focal length 70 mm
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Focus motor Generic motor
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Diameter 76 mm
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Zoom range 4.3x
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Weight 435 g
#4

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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Aperture f/4
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Length 120 mm
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Max focal length 300 mm
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Min focal length 70 mm
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Focus motor Generic motor
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Diameter 76 mm
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Zoom range 4.3x
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Weight 0.6 kg
#5

Tamron 28-300mm f/3.5-6.3 XR Di Pentax K

Tamron 28-300mm f/3.5-6.3 XR Di Pentax K

"We like the 300 mm zoom for bird photos. The auto focus is nice for first time users and occasional users." bhphotovideo.com

 
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Great zoom range
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10.7x
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Aperture f/3.5
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Length 84 mm
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Max focal length 300 mm
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Min focal length 28 mm
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Focus motor Generic motor
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Diameter 74 mm
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Zoom range 10.7x
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Weight 420 g