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Pentax K 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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Min focal length 55 mm
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Max focal length 300 mm
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Diameter 71 mm
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Focus motor Generic motor
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Weight 466 g
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Zoom range 5.5x
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Length 112 mm
#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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Min focal length 70 mm
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Max focal length 300 mm
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Diameter 77 mm
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Focus motor Generic motor
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Weight 0.5 kg
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Zoom range 4.3x
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Length 120 mm
#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

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

Sigma 300mm f/2.8 EX DG Pentax K

Sigma 300mm f/2.8 EX DG Pentax K

"It's much much sharper, even with a 1.4 TC. I highly recommend this lens." bhphotovideo.com

 
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Wide aperture
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f/2.8
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Aperture f/2.8
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Min focal length 300 mm
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Max focal length 300 mm
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Diameter 119 mm
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Focus motor Generic motor
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Weight 2.4 kg
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Zoom range 1x
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Length 213 mm
#5

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 love using this lens on my Pentax Digital camera. It has a good overall range, and the results are sharp and crisp." bhphotovideo.com

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Aperture f/4
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Min focal length 70 mm
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Max focal length 300 mm
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Diameter 76 mm
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Focus motor Generic motor
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Weight 0.6 kg
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Zoom range 4.3x
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Length 120 mm
#6

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

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

"use with Pentax K1000 Super D and it works well" 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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Min focal length 28 mm
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Max focal length 300 mm
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Diameter 74 mm
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Focus motor Generic motor
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Weight 420 g
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Zoom range 10.7x
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Length 84 mm