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Pentax K Lenses that have a f/1.8 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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Weight 269 g
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Auto focus Yes
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Min focal length 77 mm
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Length 48 mm
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Zoom range 1x
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Diameter 74 mm
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Max focal length 77 mm
#2

Pentax SMC FA 50mm f/1.4

Pentax SMC  FA 50mm f/1.4

"The pictures are very sharp. Low light is fantastic. I have not found anything I dislike about it." 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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Weight 221 g
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Auto focus Yes
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Min focal length 50 mm
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Length 38 mm
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Zoom range 1x
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Diameter 64 mm
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Max focal length 50 mm
#3

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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Weight 375 g
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Auto focus Yes
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Min focal length 55 mm
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Length 66 mm
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Zoom range 1x
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Diameter 71 mm
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Max focal length 55 mm
#4

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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Weight 122 g
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Auto focus Yes
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Min focal length 50 mm
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Length 38 mm
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Zoom range 1x
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Diameter 64 mm
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Max focal length 50 mm
#5

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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Weight 400 g
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Auto focus No
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Min focal length 56 mm
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Length n/a
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Zoom range 1x
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Diameter n/a
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Max focal length 56 mm
#6

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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Supports autofocus
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Easier to use
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Aperture f/1.8
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Weight 346 g
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Auto focus Yes
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Min focal length 31 mm
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Length 69 mm
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Zoom range 1x
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Diameter 66 mm
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Max focal length 31 mm
#7

Rokinon 50mm f/1.4 AS IF UMC Pentax-k

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Aperture f/1.4
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Weight 0.5 kg
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Auto focus No
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Min focal length 50 mm
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Length n/a
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Zoom range 1x
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Diameter n/a
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Max focal length 50 mm
#8

Sigma 50mm f/1.4 EX DG HSM Pentax K

Sigma 50mm f/1.4 EX DG HSM Pentax K

"I have been very satisfied: this lens is absolutely great for low light, or portraiture, requiring large apertures. I shoot with a Pentax k-x, non full-frame, and so the focal length is closer to 85 mm, perfect for portraits." 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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Weight 0.5 kg
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Auto focus Yes
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Min focal length 50 mm
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Length 69 mm
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Zoom range 1x
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Diameter 84 mm
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Max focal length 50 mm
#9

Sigma 30mm f/1.4 DC HSM Art Pentax-k

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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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Weight 435 g
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Auto focus Yes
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Min focal length 30 mm
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Length n/a
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Zoom range 1x
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Diameter n/a
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Max focal length 30 mm
#10

Sigma 18-35mm f/1.8 DC HSM Pentax K

Sigma 18-35mm f/1.8 DC HSM Pentax K
 
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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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Weight 0.8 kg
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Auto focus Yes
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Min focal length 18 mm
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Length 121 mm
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Zoom range 1.9x
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Diameter 78 mm
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Max focal length 35 mm