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Type

Pentax K Prime Lenses for less than $300 that have a focus motor and have a f/4 or faster aperture

#1

Pentax SMC DA 40mm f/2.8

Pentax SMC  DA 40mm f/2.8

"Great option for taking casual pictures of family and friends or for low-key urban excursions." bhphotovideo.com

 
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Supports autofocus
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Easier to use
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Aperture f/2.8
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Diameter 64 mm
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Focus motor Generic motor
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Length 15 mm
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Fisheye No
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Weight 91 g
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Auto focus Yes
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Min focal length 40 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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Length 38 mm
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Fisheye No
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Weight 122 g
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Auto focus Yes
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Min focal length 50 mm
#3

Pentax SMC 35mm DA L f/2.4 AL

Pentax SMC 35mm DA L f/2.4 AL
 
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Supports autofocus
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Easier to use
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Aperture f/2.4
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Diameter 64 mm
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Focus motor Generic motor
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Length 46 mm
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Fisheye No
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Weight 125 g
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Auto focus Yes
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Min focal length 35 mm
#4

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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Diameter 64 mm
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Focus motor Generic motor
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Length 46 mm
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Fisheye No
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Weight 200 g
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Auto focus Yes
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Min focal length 35 mm
#5

Rokinon 14mm f/2.8 IF ED UMC Pentax K

Rokinon 14mm f/2.8 IF ED UMC Pentax K
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Aperture f/2.8
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Diameter 87 mm
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Focus motor Generic motor
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Length 95 mm
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Fisheye No
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Weight 0.5 kg
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Auto focus No
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Min focal length 14 mm
#6

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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Diameter 83 mm
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Focus motor Generic motor
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Length 88 mm
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Fisheye No
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Weight 0.6 kg
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Auto focus No
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Min focal length 16 mm
#7

Rokinon 8mm f/3.5 HD Pentax K

Rokinon 8mm f/3.5 HD Pentax K
 
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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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Diameter 75 mm
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Focus motor Generic motor
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Length 77 mm
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Fisheye Yes
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Weight 428 g
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Auto focus No
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Min focal length 8 mm
#8

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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Diameter 87 mm
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Focus motor Generic motor
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Length 95 mm
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Fisheye No
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Weight 0.5 kg
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Auto focus No
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Min focal length 14 mm
#9

Pentax SMC DA 40mm f/2.8 XS

Pentax SMC DA 40mm f/2.8 XS
 
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Supports autofocus
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Easier to use
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Aperture f/2.8
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Diameter 64 mm
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Focus motor Generic motor
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Length 9 mm
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Fisheye No
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Weight 51 g
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Auto focus Yes
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Min focal length 40 mm