Wide angle focal length
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Wide aperture
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Lens category
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Lens mount
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A wide angle view of a city scape

Pentax K Wide angle lenses that are 10mm or wider and have a f/4 or faster aperture

#1

Rokinon 10mm f/2.8 ED AS NCS CS Pentax K

Rokinon 10mm f/2.8 ED AS NCS CS Pentax K
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Aperture f/2.8
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Zoom range 1x
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Min focal length 10 mm
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Diameter 86 mm
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Auto focus No
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Length 78 mm
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Fixed aperture n/a
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Weight 0.6 kg
#2

Samyang 10mm f/2.8 ED AS NCS CS Pentax K

Samyang 10mm f/2.8 ED AS NCS CS Pentax K
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Aperture f/2.8
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Zoom range 1x
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Min focal length 10 mm
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Diameter 86 mm
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Auto focus No
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Length 105 mm
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Fixed aperture n/a
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Weight 0.6 kg
#3

Sigma 10-20mm f/3.5 EX DC HSM Pentax K

Sigma 10-20mm f/3.5 EX DC HSM Pentax K

"This lens is absolutely great for scenery and landscape. I did a lot of research for a good wide-angle lens and for the price this lens was definitely my favorite." bhphotovideo.com

 
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Fixed aperture
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The same maximum aperture at all focal lengths
 
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Supports autofocus
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Easier to use
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Aperture f/3.5
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Zoom range 2x
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Min focal length 10 mm
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Diameter 86 mm
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Auto focus Yes
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Length 89 mm
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Fixed aperture Yes
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Weight 0.5 kg
#4

Sigma 10-20mm f/4-5.6 EX DC J Pentax K

Sigma 10-20mm f/4-5.6 EX DC J Pentax K
 
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Supports autofocus
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Easier to use
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Aperture f/4
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Zoom range 2x
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Min focal length 10 mm
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Diameter 86 mm
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Auto focus Yes
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Length 89 mm
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Fixed aperture No
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Weight 0.5 kg
#5

Tamron SP 10-24mm f/3.5-4.5 DI II Pentax K

Tamron SP 10-24mm f/3.5-4.5 DI II Pentax K

"Nice to have a lens that will work as a fish eye AND a regular wide angle. I took some fun pictures this weekend and was very pleased with the results." bhphotovideo.com

 
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Supports autofocus
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Easier to use
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Aperture f/3.5
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Zoom range 2.4x
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Min focal length 10 mm
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Diameter 79 mm
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Auto focus Yes
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Length 99 mm
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Fixed aperture No
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Weight 406 g