Pentax K Lenses that have a Sigma HSM focus motor

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

Fixed aperture The same aperture at all focal lengths

	Focus motor	Sigma HSM			Aperture	f/2.8
	Fisheye	No			Zoom range	2.9x
	Fixed aperture	Yes			Max focal length	200 mm
	Image stabilization	None			Length	184 mm

"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."

Wide aperture f/1.4

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

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

Fixed aperture The same aperture at all focal lengths

	Focus motor	Sigma HSM			Aperture	f/2.8
	Fisheye	No			Zoom range	3x
	Fixed aperture	Yes			Max focal length	150 mm
	Image stabilization	None			Length	135 mm

"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."

Fixed aperture The same aperture at all focal lengths

	Focus motor	Sigma HSM			Aperture	f/2.8
	Fisheye	No			Zoom range	2.9x
	Fixed aperture	Yes			Max focal length	70 mm
	Image stabilization	None			Length	95 mm

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

More advanced image stabilization Sigma OS

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

"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."

Fixed aperture The same aperture at all focal lengths

	Focus motor	Sigma HSM			Aperture	f/3.5
	Fisheye	No			Zoom range	2x
	Fixed aperture	Yes			Max focal length	20 mm
	Image stabilization	None			Length	88 mm

"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."

More advanced image stabilization Sigma OS

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

"Lens has excellent speed and sharpness."

Great zoom range 6.9x

More advanced image stabilization Sigma OS

	Focus motor	Sigma HSM			Aperture	f/3.8
	Fisheye	No			Zoom range	6.9x
	Fixed aperture	No			Max focal length	125 mm
	Image stabilization	Sigma OS			Length	n/a

"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."

More advanced image stabilization Sigma OS

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