Wide aperture
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Lens category
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Lens mount
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Focus motor
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Pentax K Lenses that have a focus motor and have a f/4 or faster aperture

#1

Pentax SMC DA* 50-135mm f/2.8 ED SDM

Pentax SMC  DA* 50-135mm f/2.8 ED SDM

"Great lens for taking pictures of the kids, fast, smooth zoom and I don't have to be in their face to get a shot, very sharp pictures..." bhphotovideo.com

 
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Fixed aperture
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The same maximum aperture at all focal lengths
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Aperture f/2.8
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Auto focus Yes
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Focus motor Pentax SDM
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Max focal length 135 mm
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Fixed aperture Yes
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Length 137 mm
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Zoom range 2.7x
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Diameter 76 mm
#2

Pentax SMC HD DA 21mm f/3.2 AL

Pentax SMC HD DA 21mm f/3.2 AL
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Aperture f/3.2
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 21 mm
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Fixed aperture n/a
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Length 25 mm
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Zoom range 1x
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Diameter 64 mm
#3

Pentax SMC DA 40mm f/2.8

Pentax SMC  DA 40mm f/2.8

"Great option for taking casual pictures of family and friends or for low-key urban excursions." bhphotovideo.com

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Aperture f/2.8
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 40 mm
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Fixed aperture n/a
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Length 15 mm
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Zoom range 1x
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Diameter 64 mm
#4

Pentax SMC FA 77mm f/1.8

Pentax SMC  FA 77mm f/1.8

"Its color rendition is simply unbelievable. It exceeds even the abilities of my 43 mm Limited for sunsets and sunrises when coupled with the CTE White Balance settings and custom Hi/Lo Key Adjust features on my K-7." bhphotovideo.com

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Aperture f/1.8
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 77 mm
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Fixed aperture n/a
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Length 48 mm
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Zoom range 1x
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Diameter 74 mm
#5

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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Great telephoto lens
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300 mm
 
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Great zoom range
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5.5x
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Aperture f/4
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 300 mm
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Fixed aperture No
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Length 112 mm
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Zoom range 5.5x
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Diameter 71 mm
#6

Pentax SMC DA 18-135mm f/3.5-5.6 ED AL DC WR

Pentax SMC  DA 18-135mm f/3.5-5.6 ED AL DC WR
 
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Great zoom range
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7.5x
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Aperture f/3.5
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 135 mm
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Fixed aperture No
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Length 76 mm
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Zoom range 7.5x
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Diameter 74 mm
#7

Pentax SMC DA 50mm f/1.8

Pentax SMC  DA 50mm f/1.8
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Aperture f/1.8
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 50 mm
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Fixed aperture n/a
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Length 38 mm
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Zoom range 1x
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Diameter 64 mm
#8

Pentax SMC FA 31mm f/1.8

Pentax SMC  FA 31mm f/1.8

"The autofocus is fast and accurate and its size and weight balances out the K7 with or without the battery grip." bhphotovideo.com

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Aperture f/1.8
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 31 mm
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Fixed aperture n/a
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Length 69 mm
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Zoom range 1x
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Diameter 66 mm
#9

Pentax SMC HD DA 70mm f/2.4

Pentax SMC HD DA 70mm f/2.4
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Aperture f/2.4
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Auto focus Yes
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Focus motor Generic motor
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Max focal length 70 mm
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Fixed aperture n/a
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Length 25 mm
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Zoom range 1x
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Diameter 64 mm
#10

Samyang 35mm f/1.4 AS UMC Pentax K

Samyang 35mm f/1.4 AS UMC Pentax K
 
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Wide aperture
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f/1.4
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Aperture f/1.4
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Auto focus No
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Focus motor Generic motor
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Max focal length 35 mm
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Fixed aperture n/a
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Length 110 mm
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Zoom range 1x
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Diameter 83 mm