Wide aperture
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Lens category
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Lens mount
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Type
A low light shot without a flash

Pentax K Prime Low light lenses that have a f/2 or faster aperture

#1

Pentax SMC FA 50mm f/1.4

Pentax SMC  FA 50mm f/1.4

$447

"I love love love this new lens, the quality of the photos is spectacular if done in the right lighting. I would absolutely recommend for novices and professionals alike."

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Supports autofocus
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Easier to use
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Aperture f/1.4
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Max focal length 50 mm
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Focus motor None
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Diameter 64 mm
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Min focal length 50 mm
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Weight 222 g
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Length 38 mm
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Auto focus Yes
#2

Sigma 50mm f/1.4 EX DG HSM Pentax-k

Sigma 50mm f/1.4 EX DG HSM Pentax-k

$499

"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."

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Silent focus motor
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Silent and fast
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Supports autofocus
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Easier to use
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Aperture f/1.4
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Max focal length 50 mm
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Focus motor Sigma HSM
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Diameter 85 mm
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Min focal length 50 mm
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Weight 0.5 kg
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Length 68 mm
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Auto focus Yes
#3

Pentax SMC 55mm f/1.4 DA* SDM

Pentax SMC 55mm f/1.4 DA* SDM

$797

"I love the lens in almost all ways. It's sharp, fast focusing, needs very little light in F1.4 and the quick shift to manual focus is really OK to have."

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Silent focus motor
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Silent and fast
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Supports autofocus
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Easier to use
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Aperture f/1.4
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Max focal length 55 mm
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Focus motor Pentax SDM
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Diameter n/a
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Min focal length 55 mm
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Weight 375 g
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Length n/a
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Auto focus Yes
#4

Sigma 35mm f/1.4 DG HSM A1 Pentax-k

Sigma 35mm f/1.4 DG HSM A1 Pentax-k

$899

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Silent focus motor
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Silent and fast
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Supports autofocus
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Easier to use
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Aperture f/1.4
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Max focal length 35 mm
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Focus motor Sigma HSM
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Diameter n/a
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Min focal length 35 mm
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Weight 0.7 kg
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Length n/a
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Auto focus Yes
#5

Sigma 85mm f/1.4 EX DG HSM Pentax-k

Sigma 85mm f/1.4 EX DG HSM Pentax-k

$899

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Silent focus motor
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Silent and fast
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Supports autofocus
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Easier to use
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Aperture f/1.4
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Max focal length 85 mm
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Focus motor Sigma HSM
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Diameter n/a
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Min focal length 85 mm
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Weight n/a
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Length n/a
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Auto focus Yes
#6

Sigma 30mm f/1.4 EX DC Pentax-k

Sigma 30mm f/1.4 EX DC Pentax-k

$439

"Awesome lens. In good to decent light, sharp and snappy AF. A 30mm f/1.4 on an crop center hits a pretty decent sweet spot. Relatively sharp (although not across the frame.) Decent MF feel, especially for a modern third party AF lens."

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Supports autofocus
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Easier to use
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Aperture f/1.4
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Max focal length 30 mm
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Focus motor None
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Diameter 76 mm
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Min focal length 30 mm
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Weight 430 g
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Length 59 mm
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Auto focus Yes
#7

Pentax SMC FA 31mm f/1.8

Pentax SMC  FA 31mm f/1.8

$1,297

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

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Supports autofocus
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Easier to use
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Aperture f/1.8
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Max focal length 31 mm
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Focus motor None
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Diameter 66 mm
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Min focal length 31 mm
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Weight 345 g
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Length 69 mm
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Auto focus Yes
#8

Pentax SMC FA 77mm f/1.8

Pentax SMC  FA 77mm f/1.8

$1,047

"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."

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Supports autofocus
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Easier to use
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Aperture f/1.8
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Max focal length 77 mm
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Focus motor None
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Diameter 48 mm
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Min focal length 77 mm
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Weight 272 g
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Length 64 mm
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Auto focus Yes
#9

Sigma 20mm f/1.8 EX DG DF RF Pentax-k

Sigma 20mm f/1.8 EX DG DF RF Pentax-k

$519

"Highly recomemded for any wide angle needs, but specially f1.8 will give you way more light than the zooms in that range."

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Supports autofocus
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Easier to use
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Aperture f/1.8
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Max focal length 20 mm
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Focus motor None
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Diameter 89 mm
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Min focal length 20 mm
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Weight 0.5 kg
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Length 86 mm
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Auto focus Yes
#10

Sigma 24mm f/1.8 EX DG DF Macro Pentax-k

Sigma 24mm f/1.8 EX DG DF Macro Pentax-k

$449

"This lens is great and does what I needed it for."

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Supports autofocus
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Easier to use
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Aperture f/1.8
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Max focal length 24 mm
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Focus motor None
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Diameter 84 mm
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Min focal length 24 mm
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Weight 485 g
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Length 79 mm
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Auto focus Yes