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Lens category
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Lens mount
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Pentax K Lenses that have a f/2 or faster aperture

#1

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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Supports autofocus
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Easier to use
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Aperture f/1.8
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Min focal length 77 mm
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Auto focus Yes
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Weight 269 g
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Diameter 74 mm
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Max focal length 77 mm
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Length 48 mm
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Zoom range 1x
#2

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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Supports autofocus
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Easier to use
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Aperture f/1.8
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Min focal length 31 mm
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Auto focus Yes
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Weight 346 g
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Diameter 66 mm
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Max focal length 31 mm
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Length 69 mm
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Zoom range 1x
#3

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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Supports autofocus
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Easier to use
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Aperture f/1.4
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Min focal length 50 mm
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Auto focus Yes
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Weight 221 g
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Diameter 64 mm
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Max focal length 50 mm
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Length 38 mm
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Zoom range 1x
#4

Pentax SMC FA 43mm f/1.9

Pentax SMC  FA 43mm f/1.9

"The build quality alone is just so superior; this little beauty is just a joy to handle." bhphotovideo.com

 
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Supports autofocus
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Easier to use
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Aperture f/1.9
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Min focal length 43 mm
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Auto focus Yes
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Weight 156 g
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Diameter 64 mm
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Max focal length 43 mm
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Length 28 mm
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Zoom range 1x
#5

Pentax SMC 55mm f/1.4 DA* SDM

Pentax SMC 55mm f/1.4 DA* SDM

"This lens produces an accurate reproduction. The f/1.4 aperature has opened-up a whole new range of photo oppurtunities." bhphotovideo.com

 
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Supports autofocus
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Easier to use
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Aperture f/1.4
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Min focal length 55 mm
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Auto focus Yes
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Weight 375 g
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Diameter 71 mm
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Max focal length 55 mm
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Length 66 mm
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Zoom range 1x
#6

Pentax SMC DA 50mm f/1.8

Pentax SMC  DA 50mm f/1.8
 
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Supports autofocus
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Easier to use
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Aperture f/1.8
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Min focal length 50 mm
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Auto focus Yes
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Weight 122 g
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Diameter 64 mm
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Max focal length 50 mm
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Length 38 mm
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Zoom range 1x
#7

Lensbaby Velvet 56mm f/1.6 Pentax K

Lensbaby Velvet 56mm f/1.6 Pentax K
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Aperture f/1.6
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Min focal length 56 mm
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Auto focus No
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Weight 400 g
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Diameter n/a
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Max focal length 56 mm
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Length n/a
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Zoom range 1x
#8

Pentax SMC 35mm f/2 FA AL

Pentax SMC 35mm f/2 FA AL
 
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Supports autofocus
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Easier to use
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Aperture f/2
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Min focal length 35 mm
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Auto focus Yes
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Weight 200 g
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Diameter 64 mm
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Max focal length 35 mm
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Length 46 mm
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Zoom range 1x
#9

Rokinon 16mm f/2 ED AS UMC CS Pentax K

Rokinon 16mm f/2 ED AS UMC CS Pentax K
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Aperture f/2
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Min focal length 16 mm
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Auto focus No
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Weight 0.6 kg
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Diameter 83 mm
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Max focal length 16 mm
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Length 88 mm
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Zoom range 1x
#10

Samyang 16mm f/2 ED AS UMC CS Pentax K

Samyang 16mm f/2 ED AS UMC CS Pentax K
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Aperture f/2
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Min focal length 16 mm
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Auto focus No
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Weight 0.6 kg
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Diameter 86 mm
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Max focal length 16 mm
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Length 88 mm
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Zoom range 1x