Pentax Lenses that have a f/4 or faster aperture

"The build quality seems top notch, no play in the focus or zoom rings at all, and very smooth action of both." bhphotovideo.com

Fixed aperture The same maximum aperture at all focal lengths

	Aperture	f/2.8			Length	137 mm
	Fixed aperture	Yes			Diameter	76 mm
	Zoom range	2.7x			Min focal length	50 mm
	Max focal length	135 mm			Weight	0.7 kg

"Great option for taking casual pictures of family and friends or for low-key urban excursions." bhphotovideo.com

	Aperture	f/2.8			Length	15 mm
	Fixed aperture	n/a			Diameter	64 mm
	Zoom range	1x			Min focal length	40 mm
	Max focal length	40 mm			Weight	91 g

"Its color rendition is simply unbelievable. It exceeds even the abilities of my 43 mm Limited for sunsets and sunrises when coupled with the CTE White Balance settings and custom Hi/Lo Key Adjust features on my K-7." bhphotovideo.com

Wide aperture f/1.8

	Aperture	f/1.8			Length	48 mm
	Fixed aperture	n/a			Diameter	74 mm
	Zoom range	1x			Min focal length	77 mm
	Max focal length	77 mm			Weight	269 g

"The autofocus is fast and accurate and its size and weight balances out the K7 with or without the battery grip." bhphotovideo.com

Wide aperture f/1.8

	Aperture	f/1.8			Length	69 mm
	Fixed aperture	n/a			Diameter	66 mm
	Zoom range	1x			Min focal length	31 mm
	Max focal length	31 mm			Weight	346 g