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The fast Pentax FA 50mm f/1.4 lens works well for all your Pentax SLRs — both DSLRs with APS-C sensors and full-frame 35mm film cameras. Well-suited for everyday news reportage, landscapes, and snapshots, this lens is also excellent for portraits when mounted on an APS-C camera as its length becomes an effective 75mm.

But this lens has other attractions. The FA 50mm is very light-sensitive and features excellent control over depth of field, so it's perfect for emotive, artistic portraits in natural light.

Product Highlights:

  • Pentax KAF 50mm f/1.4 portrait-length lens with 35mm equivalent of 75mm on APS-C cameras
  • compatible with Pentax K-mount digital/film SLRs and hybrid cameras
  • Pentax smc multi-layer coating lowers surface reflection, reduces ultraviolet rays and delivers high-contrast images
  • Quick-Shift Focus System allows instant switching from autofocus to manual focus operation
  • constructed of 7 elements in 6 groups
  • minimum focus distance: 18"
  • minimum aperture: f/22
  • filter size: 49mm
  • lens is 1-1/2" long, 2-1/2" in diameter
  • weight: 7.8 ounces
  • supplied accessories: front and rear lens caps
  • warranty: 1 year
  • Our 60-day money-back guarantee

Pentax FA 50mm f/1.4 Lens Reviews

Hands-on research

What's in the box?

Download owner's manual

  • smc Pentax FA 50mm f/1.4 lens (with attached front and rear lens caps)
  • Operating Manual
  • Notification of Change of Company Name sheet
  • Pentax Worldwide Service Network sheet
  • Serial Number Card

Features and Specs

Brand Compatibility Pentax
Image Stabilization No
Focal Length 50mm
Maximum Aperture F1.4
Weight 7.76 ounces
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research


Overview: The smc Pentax FA 50mm F1.4 is a standard lens that is recommended for indoor photography, portraiture, low light photography, still life, and wedding photography. The lens was developed for Pentax film SLR cameras, but full frame optics are also compatible with Pentax digital SLR cameras. Its fast F1.4 aperture offers outstanding depth-of-field control in all types of lighting conditions.

Lens Mount: The lens has a Pentax K-mount, and can fit Pentax D-SLR and interchangeable lens cameras, including the Pentax K-5 and K-01 cameras.

smc Lens Coating: The Pentax FA 50mm F1.4 lens features the acclaimed Pentax smc multi-layer coating to lower surface reflection, reduce ultraviolet rays and deliver clear, high-contrast images.


  • Focal Length: 50mm
  • 35mm Equivalent: 75mm
  • Lens Construction: 7 elements in 6 groups
  • Mount Type: Pentax K-mount
  • Maximum Aperture: F1.4
  • Minimum Aperture: F22
  • Maximum Magnification: 0.15x
  • Angle of View: 47°
  • Minimum Focus Distance: 17.72"
  • Lens Hood: PH-RBC 49mm (not included)
  • Filter Diameter: 49mm
  • Dimensions:
    • Diameter: 2.542"
    • Length: 1.889" (2.218" w/caps)
    • Weight: 7.76 ounces

Our Product Research Team

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Product reviews from the Crutchfield Labs

Fast and compact, everything you'd want it to be

Written by Zak Billmeier, Staff Writer - Creative, on 4/30/2012 4:27:00 PM

I used this lens with the K-01 recently, and came away really liking it. It's fairly compact and balances well on the camera. I was shooting a lot of pictures indoors with only a lamp providing light, and it handled those tough situations with ease. The lens gave me super shallow depth-of-field wide open, then got really sharp once stopped down a little, like a good 50mm should do.

On a Pentax SLR this one behaves like a 75mm, so it's a great portrait lens. If I had to choose only one lens for a Pentax camera, it would be this one — great in any light, sharp, compact.

What are the Labs?