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Lens category
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Pentax Lenses that are 10mm or wider and have a f/4 or faster aperture

#1

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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Min focal length 10 mm
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Length 71 mm
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Fisheye Yes
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Weight 320 g
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Diameter 69 mm
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Max focal length 17 mm
#2

Pentax SMC 5-15mm f/2.8-4.5

Pentax SMC 5-15mm f/2.8-4.5
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Aperture f/2.8
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Zoom range 3x
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Min focal length 5 mm
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Length 48 mm
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Fisheye No
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Weight 96 g
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Diameter 49 mm
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Max focal length 15 mm