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A black and white portrait of a man

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

#1

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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Length 38 mm
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Focus motor Generic motor
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Min focal length 50 mm
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Max focal length 50 mm
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Diameter 64 mm
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Zoom range 1x
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Weight 122 g
#2

Pentax SMC HD DA 18-50mm f/4-5.6 DC WR RE

Pentax SMC HD DA 18-50mm f/4-5.6 DC WR RE
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Aperture f/4
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Length 41 mm
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Focus motor Generic motor
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Min focal length 18 mm
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Max focal length 50 mm
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Diameter 71 mm
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Zoom range 2.8x
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Weight 158 g
#3

Pentax SMC DA 18-55mm f/3.5-5.6 AL WR

Pentax SMC DA 18-55mm f/3.5-5.6 AL WR

"This lens is workhorses, very nice contrast, fast autofocus, WR is very nice, just like water proof, I took alot pictures during raining, white water rafting, biking." bhphotovideo.com

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Aperture f/3.5
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Length 69 mm
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Focus motor Generic motor
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Min focal length 18 mm
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Max focal length 55 mm
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Diameter 69 mm
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Zoom range 3.1x
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Weight 230 g
#4

Pentax SMC DA 50-200mm f/4-5.6 ED WR

Pentax SMC  DA 50-200mm f/4-5.6 ED WR

"Great lens, exactly as advertised. Easy to focus. Perfect for the camera body." bhphotovideo.com

 
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Great telephoto lens
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200 mm
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Aperture f/4
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Length 79 mm
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Focus motor Generic motor
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Min focal length 50 mm
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Max focal length 200 mm
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Diameter 69 mm
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Zoom range 4x
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Weight 286 g