Wide aperture
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Lens category
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Lens mount
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Focus motor
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Type

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

#1

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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Zoom range 2.8x
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Focus motor Generic motor
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Length 41 mm
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Fisheye No
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Min focal length 18 mm
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Max focal length 50 mm
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Weight 158 g
#2

Pentax SMC DA 10-17mm f/3.5-4.5 ED

Pentax SMC  DA 10-17mm f/3.5-4.5 ED

"I am very pleased with this lens so far. It is built well and shots are very clear. " bhphotovideo.com

 
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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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Zoom range 1.7x
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Focus motor Generic motor
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Length 71 mm
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Fisheye Yes
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Min focal length 10 mm
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Max focal length 17 mm
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Weight 320 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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Zoom range 3.1x
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Focus motor Generic motor
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Length 69 mm
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Fisheye No
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Min focal length 18 mm
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Max focal length 55 mm
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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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Zoom range 4x
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Focus motor Generic motor
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Length 79 mm
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Fisheye No
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Min focal length 50 mm
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Max focal length 200 mm
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Weight 286 g