Pentax Pushes K-mount Lens Series Forward with Full-frame 50mm f/1.4 SDM AW

Pentax is adding the 50mm f/1.4 SDM AW to it K-mount series. It’s a full-frame lens with an SDM ultrasonic autofocus motor and ghosting/flare prevention.

Looking inside the lens

The 50mm f/1.4 consists of 15 elements in 9 groups with 1 aspherical element. There are nine rounded aperture blades, and the lens’s f-stop range runs from f/1.4 to f/16. It also features a minimum focusing distance of 1.3 feet and its front threading accepts 72mm filters.

And as said previously, the lens has an SDM ultrasonic autofocus motor which it should help smooth and speedy autofocus according to B&H. The lens uses an electromagnetic diaphragm and is fully compatible with the K-1, K-1 Mark II, K-3, K-3 II, KP, K-70, K-S2 and K-S1.

Two images of Pentax's 50mm f/1.4 SDM AW
The 50mm f/1.4 contains nine rounded aperture blades and 15 elements in 9 groups with 1 aspherical element

The lens is also sealed to keep out dust and moisture and weighs 910 grams, or 2 pounds.

Reduced flare and ghosting with weather protection

Pentax has included a few coatings on the 50mm f/1.4 to reduce ghosting and flare. And those aren’t all the coatings this lens has. It also uses Aero Bright II coatings in tandem and SP coatings on the front lens element to help repel dust and water.


Sample photo taken with the 50mm f/1.4 SDM AW
There’s some great Bokeh in this sample image taken with the 50mm f/1.4
Another sample image taken using the 50mm f/1.4 SDM AW
The lens has HD coatings to reduce ghosting and flare


  • K-Mount Lens/Full-Frame Format
  • Aperture Range: f/1.4 to f/16
  • 1 Aspherical Element
  • Anomalous Dispersion Aspherical Element
  • Ultrasonic Motor SDM
  • Aero Bright Coating II & HD Coating
  • Front Element SP Coating
  • Rounded 9-blade Diaphragm
  • Weather Sealed

Pricing and availability

Pentax will be releasing the K-Series 50mm f/1.4 SDM AW in late July for $1,199.

Sean Berry
Sean Berry
Sean Berry is Videomaker's Managing Editor.

Related Content