Pentax K-01 with 40mm f/2.8 lens Telephoto 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
	Zoom range	2.9x			Weight	1.4 kg
	Fixed aperture	Yes			Max focal length	200 mm
	Image stabilization	None			Min focal length	70 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
	Zoom range	3x			Weight	0.8 kg
	Fixed aperture	Yes			Max focal length	150 mm
	Image stabilization	None			Min focal length	50 mm

"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."

	Focus motor	Sigma HSM			Aperture	f/4
	Zoom range	4x			Weight	n/a
	Fixed aperture	No			Max focal length	200 mm
	Image stabilization	Sigma OS			Min focal length	50 mm

"I use it for sports and wildlife and realy enjoy it. AF is fast and make about no noise at all so it's very good for nature shooting."

Great telephoto lens 400 mm

	Focus motor	Sigma HSM			Aperture	f/4.5
	Zoom range	3.3x			Weight	1.7 kg
	Fixed aperture	No			Max focal length	400 mm
	Image stabilization	None			Min focal length	120 mm

"I gave it 5 stars based on what I would expect from a zoom lens and the image quality is really quite impressive for a super zoom; better than anything else of this type that I've seen. It is a good, solid, well made lens and I couldn't be happier with it."

Great zoom range 13.9x

	Focus motor	Sigma HSM			Aperture	f/3.5
	Zoom range	13.9x			Weight	0.6 kg
	Fixed aperture	No			Max focal length	250 mm
	Image stabilization	Sigma OS			Min focal length	18 mm