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

#1

Pentax SMC FA 50mm f/1.4

Pentax SMC  FA 50mm f/1.4

"I love love love this new lens, the quality of the photos is spectacular if done in the right lighting. I would absolutely recommend for novices and professionals alike." 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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Zoom range 1x
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Fixed aperture n/a
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Auto focus Yes
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Min focal length 50 mm
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Max focal length 50 mm
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Length 38 mm
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Weight 221 g
#2

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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Great telephoto lens
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300 mm
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Aperture f/4
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Zoom range 1x
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Fixed aperture n/a
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Auto focus Yes
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Min focal length 300 mm
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Max focal length 300 mm
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Length 183 mm
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Weight 1.1 kg
#3

Pentax SMC FA 77mm f/1.8

Pentax SMC  FA 77mm f/1.8

"Great multi-purpose performing lens, particularly if you want to travel light and leave the bag at home." 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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Zoom range 1x
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Fixed aperture n/a
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Auto focus Yes
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Min focal length 77 mm
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Max focal length 77 mm
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Length 48 mm
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Weight 269 g
#4

Pentax SMC HD D FA* 70-200mm f/2.8 ED DC AW

Pentax SMC HD D FA* 70-200mm f/2.8 ED DC AW
 
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Fixed aperture
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The same maximum aperture at all focal lengths
 
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Great telephoto lens
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200 mm
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Aperture f/2.8
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Zoom range 2.9x
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Fixed aperture Yes
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Auto focus Yes
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Min focal length 70 mm
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Max focal length 200 mm
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Length 203 mm
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Weight 1.8 kg
#5

Pentax SMC DA 50mm f/1.8

Pentax SMC  DA 50mm f/1.8
 
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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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Zoom range 1x
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Fixed aperture n/a
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Auto focus Yes
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Min focal length 50 mm
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Max focal length 50 mm
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Length 38 mm
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Weight 122 g
#6

Samyang 14mm f/2.8 IF ED UMC Pentax K

Samyang 14mm f/2.8 IF ED UMC Pentax K
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Aperture f/2.8
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Zoom range 1x
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Fixed aperture n/a
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Auto focus No
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Min focal length 14 mm
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Max focal length 14 mm
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Length 95 mm
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Weight 0.5 kg
#7

Pentax SMC DA FA 100mm f/2.8 WR Macro

Pentax SMC  DA FA 100mm f/2.8 WR Macro

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

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Aperture f/2.8
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Zoom range 1x
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Fixed aperture n/a
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Auto focus Yes
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Min focal length 100 mm
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Max focal length 100 mm
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Length 64 mm
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Weight 340 g
#8

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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Zoom range 7.5x
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Fixed aperture No
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Auto focus Yes
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Min focal length 18 mm
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Max focal length 135 mm
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Length 76 mm
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Weight 405 g
#9

Pentax SMC FA 31mm f/1.8

Pentax SMC  FA 31mm f/1.8

"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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Zoom range 1x
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Fixed aperture n/a
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Auto focus Yes
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Min focal length 31 mm
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Max focal length 31 mm
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Length 69 mm
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Weight 346 g
#10

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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Zoom range 1x
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Fixed aperture n/a
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Auto focus Yes
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Min focal length 70 mm
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Max focal length 70 mm
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Length 25 mm
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Weight 130 g