Brand
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Wide aperture
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Price
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Camera
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Pentax K-7
Lens category
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Type
Pentax K-7

Pentax K-7 Zoom Wide angle lenses made by Pentax for less than $400 that have a f/4 or faster aperture

#1

Pentax SMC DA 18-135mm f/3.5-5.6 ED AL DC WR

Pentax SMC  DA 18-135mm f/3.5-5.6 ED AL DC WR
 
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Great zoom range
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7.5x
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Aperture f/3.5
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Length 76 mm
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Fixed aperture No
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Weight 405 g
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Zoom range 7.5x
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Diameter 74 mm
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Max focal length 135 mm
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Min focal length 18 mm
#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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Fixed aperture No
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Weight 158 g
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Zoom range 2.8x
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Diameter 71 mm
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Max focal length 50 mm
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Min focal length 18 mm
#3

Pentax SMC DA 17-70mm f/4 AL SDM

Pentax SMC  DA 17-70mm f/4 AL SDM

"The lens is well-made, the SDM focusing is fast and quiet (used on a Pentax K20D), images are sharp throughout the zoom range, the bokeh is pleasing, and the lens is weatherproof" bhphotovideo.com

 
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Fixed aperture
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The same maximum aperture at all focal lengths
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Aperture f/4
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Length 94 mm
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Fixed aperture Yes
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Weight 485 g
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Zoom range 4.1x
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Diameter 76 mm
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Max focal length 70 mm
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Min focal length 17 mm
#4

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

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

"For landscape photos during the winter months and in wet or dusty conditions, it is a great lens." bhphotovideo.com

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Aperture f/3.5
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Length 69 mm
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Fixed aperture No
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Weight 230 g
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Zoom range 3.1x
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Diameter 69 mm
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Max focal length 55 mm
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Min focal length 18 mm