Wide aperture
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Lens category
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Lens mount
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Pentax K Lenses that have a f/4 or faster aperture

#1

Pentax SMC FA 77mm f/1.8

Pentax SMC  FA 77mm f/1.8

"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

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Aperture f/1.8
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 77 mm
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Min focal length 77 mm
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Weight 269 g
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Length 48 mm
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Diameter 74 mm
#2

Pentax SMC DA FA 100mm f/2.8 WR Macro

Pentax SMC  DA FA 100mm f/2.8 WR Macro

"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

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Aperture f/2.8
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 100 mm
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Min focal length 100 mm
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Weight 340 g
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Length 64 mm
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Diameter 81 mm
#3

Pentax SMC FA 43mm f/1.9

Pentax SMC  FA 43mm f/1.9

"The build quality alone is just so superior; this little beauty is just a joy to handle." bhphotovideo.com

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Aperture f/1.9
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 43 mm
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Min focal length 43 mm
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Weight 156 g
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Length 28 mm
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Diameter 64 mm
#4

Pentax SMC DA 40mm f/2.8

Pentax SMC  DA 40mm f/2.8

"This lens is light weight and very compact. It is fast enough for low light applications and is built like a tank." bhphotovideo.com

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Aperture f/2.8
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 40 mm
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Min focal length 40 mm
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Weight 91 g
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Length 15 mm
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Diameter 64 mm
#5

Pentax SMC DA 18-135mm f/3.5-5.6 ED AL DC WR

Pentax SMC  DA 18-135mm f/3.5-5.6 ED AL DC WR
 
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Great zoom range
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7.5x
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Aperture f/3.5
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Zoom range 7.5x
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Fixed aperture No
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Max focal length 135 mm
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Min focal length 18 mm
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Weight 405 g
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Length 76 mm
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Diameter 74 mm
#6

Pentax SMC DA 50-200mm f/4-5.6 ED WR

Pentax SMC  DA 50-200mm f/4-5.6 ED WR

"Great lens, exactly as advertised. Easy to focus. Perfect for the camera body." bhphotovideo.com

 
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Great zoom range
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4x
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Aperture f/4
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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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Min focal length 50 mm
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Weight 286 g
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Length 79 mm
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Diameter 69 mm
#7

Pentax SMC DA* 300mm f/4 ED SDM

Pentax SMC  DA* 300mm f/4 ED SDM

"Stellar performer. Very sharp, and works well with in-body stabilisation, which is more noticable/effective at this focal length. Suprisingly good bokeh! This has now become my default lens bushwalking, with a shorter macro and wide prime in the bag. Very versatile thanks to close minimum focus distance. Not as big as imagined. About as heavy as expected (not light, but probably good for this class of lens). Overall GREAT and well worth the investment." bhphotovideo.com

 
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Great telephoto lens
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300 mm
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Aperture f/4
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 300 mm
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Min focal length 300 mm
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Weight 1.1 kg
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Length 183 mm
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Diameter 84 mm
#8

Pentax SMC HD D FA* 70-200mm f/2.8 ED DC AW

Pentax SMC HD D FA* 70-200mm f/2.8 ED DC AW
 
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Fixed aperture
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The same maximum aperture at all focal lengths
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Aperture f/2.8
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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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Min focal length 70 mm
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Weight 1.8 kg
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Length 203 mm
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Diameter 92 mm
#9

Pentax SMC DA 50mm f/1.8

Pentax SMC  DA 50mm f/1.8
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Aperture f/1.8
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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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Min focal length 50 mm
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Weight 122 g
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Length 38 mm
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Diameter 64 mm
#10

Pentax SMC 35mm DA L f/2.4 AL

Pentax SMC 35mm DA L f/2.4 AL
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Aperture f/2.4
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Zoom range 1x
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Fixed aperture n/a
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Max focal length 35 mm
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Min focal length 35 mm
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Weight 125 g
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Length 46 mm
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Diameter 64 mm