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Focus motor
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Pentax K Lenses that have a Sigma HSM focus motor

#1

Sigma 70-200mm f/2.8 II EX DG APO Macro HSM Pentax-k

Sigma 70-200mm f/2.8 II EX DG APO Macro HSM Pentax-k

$799

"I use the lens for landscape and wildlife photography. Love the fast quiet autofocus and very sharp image quality."

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Fixed aperture
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The same aperture at all focal lengths
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Focus motor Sigma HSM
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Aperture f/2.8
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Fisheye No
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Zoom range 2.9x
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Fixed aperture Yes
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Max focal length 200 mm
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Image stabilization None
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Length 184 mm
#2

Sigma 50mm f/1.4 EX DG HSM Pentax-k

Sigma 50mm f/1.4 EX DG HSM Pentax-k

$499

"I have been very satisfied: this lens is absolutely great for low light, or portraiture, requiring large apertures. I shoot with a Pentax k-x, non full-frame, and so the focal length is closer to 85 mm, perfect for portraits."

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Wide aperture
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f/1.4
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Focus motor Sigma HSM
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Aperture f/1.4
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Fisheye No
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 50 mm
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Image stabilization None
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Length 68 mm
#3

Sigma 50-150mm f/2.8 II EX DC HSM Pentax-k

Sigma 50-150mm f/2.8 II EX DC HSM Pentax-k

$749

"Well built, nicely damped MF, fast accurate AF, acceptably sharp wide open, even better at F/4, and really pleasing bokeh."

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Fixed aperture
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The same aperture at all focal lengths
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Focus motor Sigma HSM
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Aperture f/2.8
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Fisheye No
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Zoom range 3x
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Fixed aperture Yes
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Max focal length 150 mm
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Image stabilization None
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Length 135 mm
#4

Sigma 24-70mm f/2.8 IF EX DG HSM Pentax-k

Sigma 24-70mm f/2.8 IF EX DG HSM Pentax-k

$899

"Great lens "portrait sharp" at 2.8 phenomenally sharp at f8 (equal if not better than 35ltd) great rendering. HSM is quiet and fast, build quality is great."

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Fixed aperture
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The same aperture at all focal lengths
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Focus motor Sigma HSM
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Aperture f/2.8
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Fisheye No
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Zoom range 2.9x
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Fixed aperture Yes
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Max focal length 70 mm
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Image stabilization None
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Length 95 mm
#5

Sigma 4.5mm f/2.8 EX DC HSM Pentax-k

Sigma 4.5mm f/2.8 EX DC HSM Pentax-k

$999

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Fisheye
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Extremely wide circular images
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Focus motor Sigma HSM
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Aperture f/2.8
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Fisheye Yes
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 4.5 mm
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Image stabilization None
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Length 78 mm
#6

Sigma 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

Sigma 17-70mm f/2.8-4 DC Macro OS HSM Pentax-k

$449

"The is a great upgrade from a kit lens. Good focal length range, speed and macro ability."

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More advanced image stabilization
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Sigma OS
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Focus motor Sigma HSM
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Aperture f/2.8
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Fisheye No
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Zoom range 4.1x
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Fixed aperture No
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Max focal length 70 mm
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Image stabilization Sigma OS
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Length 83 mm
#7

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

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

$649

"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."

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Fixed aperture
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The same aperture at all focal lengths
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Focus motor Sigma HSM
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Aperture f/3.5
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Fisheye No
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Zoom range 2x
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Fixed aperture Yes
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Max focal length 20 mm
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Image stabilization None
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Length 88 mm
#8

Sigma 18-50mm f/2.8-4.5 DC OS HSM Pentax-k

Sigma 18-50mm f/2.8-4.5 DC OS HSM Pentax-k

$199

"This is a solid lens. I'm not 100% convinced the OS in this lens is an improvement over the body image stabilization, but it seems to be roughly equivalent."

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More advanced image stabilization
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Sigma OS
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Focus motor Sigma HSM
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Aperture f/2.8
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Fisheye No
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Zoom range 2.8x
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Fixed aperture No
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Max focal length 50 mm
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Image stabilization Sigma OS
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Length n/a
#9

Sigma 18-125mm f/3.8-5.6 DC OS HSM Pentax-k

Sigma 18-125mm f/3.8-5.6 DC OS HSM Pentax-k

$339

"Lens has excellent speed and sharpness."

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Great zoom range
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6.9x
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More advanced image stabilization
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Sigma OS
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Focus motor Sigma HSM
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Aperture f/3.8
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Fisheye No
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Zoom range 6.9x
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Fixed aperture No
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Max focal length 125 mm
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Image stabilization Sigma OS
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Length n/a
#10

Sigma 50-200mm f/4-5.6 DC OS HSM Pentax-k

Sigma 50-200mm f/4-5.6 DC OS HSM Pentax-k

$159

"I am shooting through this lens, and I am loving the results. I really haven't had any complaints about it and it has performed as described."

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More advanced image stabilization
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Sigma OS
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Focus motor Sigma HSM
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Aperture f/4
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Fisheye No
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Zoom range 4x
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Fixed aperture No
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Max focal length 200 mm
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Image stabilization Sigma OS
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Length 102 mm