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Pentax smc DA 50mm f/1.8 Lens

BH #PE5018DA • MFR #22177
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Pentax smc DA 50mm f/1.8 Lens
Key Features
  • Very Fast f/1.8 Maximum Aperture
  • Excellent Low-Light Lens
  • Pleasing Bokeh (Out-of-Focus Areas)
  • SP Coating Repels Dust, Water, Grease
The smc DA 50mm f/1.8 Lens from Pentax is a fast f/1.8 lens for cameras with a Pentax K mount. Mounted to a camera with an APS-C sensor, this lens gives an angle of view equivalent to a 76.5mm telephoto lens--ideal for portraits. The wide f/1.8 aperture makes this an essential lens for working in low light, and it also delivers beautiful bokeh (the out-of-focus portion of a photograph). This lightweight (4.3 oz) lens is very compact--just 1.5" (3.8 cm) long. The addition of Pentax Super Protect (SP) coating to the lens helps prevent dust, water, grease and other substances from attaching themselves to a lens and degrading image quality.
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Pentax DA 50mm f/1.8 Overview

The smc DA 50mm f/1.8 Lens from Pentax is a fast f/1.8 lens for cameras with a Pentax K mount. Mounted to a camera with an APS-C sensor, this lens gives an angle of view equivalent to a 76.5mm telephoto lens--ideal for portraits. The wide f/1.8 aperture makes this an essential lens for working in low light, and it also delivers beautiful bokeh (the out-of-focus portion of a photograph). This lightweight (4.3 oz) lens is very compact--just 1.5" (3.8 cm) long. The addition of Pentax Super Protect (SP) coating to the lens helps prevent dust, water, grease and other substances from attaching themselves to a lens and degrading image quality.

Very fast f/1.8 maximum aperture is ideal for low light situations and produces pleasing bokeh in the out-of-focus areas of a photograph
76.5mm telephoto equivalent in APS-C format
The lens is treated with the Pentax's original SP (Super Protect) coating, which repels dust, water, grease, and other substances that may adhere to the surface of the lens. The protective coating promotes trouble-free use in all kinds of shooting situations.
UPC: 027075217607

Pentax DA 50mm f/1.8 Specs

Focal Length
50mm (35mm Equivalent: 76.5mm)
Aperture
Maximum: f/1.8
Minimum: f/22
Lens Mount
Pentax K
Lens Format Coverage
APS-C
Angle of View
31.5°
Minimum Focus Distance
1.48' / 45.11 cm
Magnification
1:6.67 Macro Reproduction Ratio
0.15x Magnification
Optical Design
6 Elements in 5 Groups
Aperture/Iris Blades
7
Focus Type
Autofocus
Image Stabilization
No
Filter Size
52 mm (Front)
Dimensions
ø: 2.5 x L: 1.5" / ø: 6.35 x L: 3.81 cm
Weight
4.3 oz / 122 g
Packaging Info
Package Weight
0.47 lb
Box Dimensions (LxWxH)
3.85 x 3.7 x 3.45"

Pentax DA 50mm f/1.8 Reviews

do not waste your money

By Richard
Rated 1 out of 5
Date: 2026-04-23

worst lens i have ever owned. soft and out of focus. turns out pentax uses a third party company to do their repair/warranty work. got the lens brand new from b+h but did not get around to testing it out until after the 30day return date. b+h is a great company, but i am now stuck with a dud of a lens, my own fault.

Nice portrait lens

By Steve
Rated 5 out of 5
Date: 2022-08-08

It is a fast lens that is great for indoor portraits. Rarely have to use the flash to take indoor portraits which is nice to take advantage of natural light sources. Nice range of depth of field because of the wide aperture which can create sharp or shallow backgrounds which is very useful in taking landscapes and personal portraits. You can get very creative with your photography by changing the aperture settings. It is very easy to carry the lens on camera because of its feather light weight.

See any errors on this page?

question

Will this fit my pentax k-30 .
Asked by: Anonymous
Yes, this lens is fully compatible with your Pentax K-30 camera.
Answered by: Yos O.
Date published: 2018-08-28

What protective bag or caase would you receommend ...

What protective bag or caase would you receommend for this lens?
Asked by: Jennifer
The Pentax smc DA 50mm f/1.8 Lens would fit well in the OP/TECH USA Fold-Over Pouch #301 (Black): BH #OPFOP301B • MFR #7801042. https://bhpho.to/3FmEIKP.
Answered by: Dan W
Date published: 2025-05-28

question

would it work with my Pentax K-X?
Asked by: Anonymous
The Pentax smc DA 50mm f/1.8 lens is compatible with the Pentax K-x.
Answered by: Christina S.
Date published: 2018-08-28

question

Is it compatible with Pentax K-r?
Asked by: Anonymous
The Pentax smc DA 50mm f/1.8 lens is compatible with the Pentax K-r.
Answered by: Christina S.
Date published: 2018-08-28

Would this mount to Pentax ME Super?

Would this mount to Pentax ME Super?
Asked by: andrew
This is a Pentaxk K-mount lents. Find out if your camera is a k-mount.
Answered by: Juan Carlos
Date published: 2020-08-12

When used with K1 mark 2 will this still be 50mm?

When used with K1 mark 2 will this still be 50mm?
Asked by: lew
I would look at the Pentax Normal SMCP-FA 50mm f/1.4 Autofocus Lens linked here. https://bhpho.to/3fFVEfA
Answered by: Scott A.
Date published: 2021-06-03

is it all plastic?

is it all plastic?
Asked by: Dinh
Yes it is , but well build
Answered by: vilson
Date published: 2021-01-18

question

Whats the warranty on the Lens?
Asked by: Anonymous
The Pentax SMC DA 50mm f/1.8 lens is covered by a one year, limited warranty.
Answered by: Heather S.
Date published: 2018-08-28
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