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Pentax K Lenses for less than $700 that are 10mm or wider and have a f/2.8 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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Min focal length 10 mm
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Diameter 86 mm
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Aperture f/2.8
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Length 78 mm
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Fisheye No
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Weight 0.6 kg
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Auto focus No
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Zoom range 1x
#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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Min focal length 10 mm
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Diameter 86 mm
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Aperture f/2.8
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Length 105 mm
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Fisheye No
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Weight 0.6 kg
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Auto focus No
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Zoom range 1x
#3

Sigma 10mm f/2.8 EX DC HSM Pentax K

Sigma 10mm f/2.8 EX DC HSM Pentax K
 
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Fisheye
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Extremely wide circular images
 
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Supports autofocus
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Easier to use
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Min focal length 10 mm
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Diameter 76 mm
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Aperture f/2.8
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Length 84 mm
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Fisheye Yes
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Weight 476 g
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Auto focus Yes
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Zoom range 1x