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Lens mount
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Pentax K Lenses that have a f/4 or faster aperture

#1

Pentax SMC DA 10-17mm f/3.5-4.5 ED

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"I just love this lense! Sharp, exact focus on the k10 and superbly build. " bhphotovideo.com

 
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Fisheye
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Extremely wide circular images
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Aperture f/3.5
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Min focal length 10 mm
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Zoom range 1.7x
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Diameter 69 mm
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Fisheye Yes
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Length 71 mm
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Max focal length 17 mm
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Weight 320 g
#2

Pentax SMC FA 50mm f/1.4

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"The pictures are very sharp. Low light is fantastic. I have not found anything I dislike about it." bhphotovideo.com

 
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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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Min focal length 50 mm
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Zoom range 1x
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Diameter 64 mm
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Fisheye No
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Length 38 mm
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Max focal length 50 mm
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Weight 221 g
#3

Pentax SMC DA 50mm f/1.8

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f/1.8
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Aperture f/1.8
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Min focal length 50 mm
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Zoom range 1x
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Diameter 64 mm
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Fisheye No
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Length 38 mm
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Max focal length 50 mm
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Weight 122 g
#4

Pentax SMC DA FA 100mm f/2.8 WR Macro

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"It is light weight, very smooth, very sharp images" bhphotovideo.com

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Aperture f/2.8
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Min focal length 100 mm
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Zoom range 1x
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Diameter 81 mm
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Fisheye No
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Length 64 mm
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Max focal length 100 mm
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Weight 340 g
#5

Pentax SMC HD DA 20-40mm f/2.8-4 ED DC WR

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Aperture f/2.8
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Min focal length 20 mm
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Zoom range 2x
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Diameter 71 mm
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Fisheye No
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Length 69 mm
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Max focal length 40 mm
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Weight 283 g
#6

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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Min focal length 18 mm
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Zoom range 7.5x
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Diameter 74 mm
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Fisheye No
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Length 76 mm
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Max focal length 135 mm
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Weight 405 g
#7

Pentax SMC DAA 18-270mm f/3.5-6.3 ED SDM

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Great zoom range
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15x
 
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Great telephoto lens
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270 mm
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Aperture f/3.5
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Min focal length 18 mm
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Zoom range 15x
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Diameter 76 mm
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Fisheye No
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Length 89 mm
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Max focal length 270 mm
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Weight 453 g
#8

Pentax SMC FA 31mm f/1.8

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"A thing of beauty that takes stunning photos." bhphotovideo.com

 
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Wide aperture
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f/1.8
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Aperture f/1.8
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Min focal length 31 mm
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Zoom range 1x
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Diameter 66 mm
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Fisheye No
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Length 69 mm
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Max focal length 31 mm
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Weight 346 g
#9

Pentax SMC 35mm DA L f/2.4 AL

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Aperture f/2.4
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Min focal length 35 mm
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Zoom range 1x
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Diameter 64 mm
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Fisheye No
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Length 46 mm
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Max focal length 35 mm
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Weight 125 g
#10

Pentax SMC DA 18-55mm f/3.5-5.6 AL WR

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"For landscape photos during the winter months and in wet or dusty conditions, it is a great lens." bhphotovideo.com

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Aperture f/3.5
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Min focal length 18 mm
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Zoom range 3.1x
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Diameter 69 mm
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Fisheye No
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Length 69 mm
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Max focal length 55 mm
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Weight 230 g