Pentax Prime Lenses that have a generic focus motor and have a f/4 or faster aperture

"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
	Focus motor	Generic motor			Max focal length	40 mm
	Min focal length	40 mm			Weight	91 g
	Diameter	64 mm			Auto focus	Yes

"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

	Aperture	f/1.8			Length	48 mm
	Focus motor	Generic motor			Max focal length	77 mm
	Min focal length	77 mm			Weight	269 g
	Diameter	74 mm			Auto focus	Yes

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

	Aperture	f/1.8			Length	69 mm
	Focus motor	Generic motor			Max focal length	31 mm
	Min focal length	31 mm			Weight	346 g
	Diameter	66 mm			Auto focus	Yes

"The pictures are very sharp. Low light is fantastic. I have not found anything I dislike about it." bhphotovideo.com

Wide aperture f/1.4

	Aperture	f/1.4			Length	38 mm
	Focus motor	Generic motor			Max focal length	50 mm
	Min focal length	50 mm			Weight	221 g
	Diameter	64 mm			Auto focus	Yes

"I bought this in conjunction with the 160fc ringflash, perfect match for this lens.. Aside from being exellent at macro, I found this lens to be stuningly vibrant and contrasty for normal shooting.." bhphotovideo.com

	Aperture	f/2.8			Length	64 mm
	Focus motor	Generic motor			Max focal length	100 mm
	Min focal length	100 mm			Weight	340 g
	Diameter	81 mm			Auto focus	Yes