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Pentax K Lenses that have a generic focus motor and have a f/1.8 or faster aperture

#1

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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Supports autofocus
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Easier to use
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Aperture f/1.8
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Diameter 74 mm
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Focus motor Generic motor
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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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Length 48 mm
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Max focal length 77 mm
#2

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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Diameter 64 mm
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Focus motor Generic motor
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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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Length 38 mm
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Max focal length 50 mm
#3

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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Diameter 66 mm
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Focus motor Generic motor
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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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Length 69 mm
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Max focal length 31 mm
#4

Samyang 35mm f/1.4 AS UMC Pentax K

Samyang 35mm f/1.4 AS UMC Pentax K
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Aperture f/1.4
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Diameter 83 mm
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Focus motor Generic motor
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Min focal length 35 mm
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Auto focus No
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Weight 0.7 kg
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Length 110 mm
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Max focal length 35 mm
#5

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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Diameter 64 mm
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Focus motor Generic motor
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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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Length 38 mm
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Max focal length 50 mm
#6

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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Diameter n/a
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Focus motor Generic motor
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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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Length n/a
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Max focal length 56 mm
#7

Rokinon 24mm f/1.4 ED AS UMC Pentax K

Rokinon 24mm f/1.4 ED AS UMC Pentax K
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Aperture f/1.4
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Diameter 83 mm
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Focus motor Generic motor
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Min focal length 24 mm
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Auto focus No
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Weight n/a
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Length 96 mm
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Max focal length 24 mm
#8

Rokinon 35mm f/1.4 AS UMC Pentax K

Rokinon 35mm f/1.4 AS UMC Pentax K
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Aperture f/1.4
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Diameter 83 mm
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Focus motor Generic motor
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Min focal length 35 mm
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Auto focus No
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Weight 0.7 kg
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Length 110 mm
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Max focal length 35 mm
#9

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

Placeholder
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Aperture f/1.4
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Diameter n/a
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Focus motor Generic motor
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Min focal length 50 mm
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Auto focus No
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Weight 0.5 kg
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Length n/a
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Max focal length 50 mm
#10

Rokinon 85mm f/1.4 Pentax K

Rokinon 85mm f/1.4 Pentax K
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Aperture f/1.4
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Diameter 70 mm
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Focus motor Generic motor
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Min focal length 85 mm
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Auto focus No
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Weight 0.6 kg
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Length 83 mm
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Max focal length 85 mm