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Pentax Telephoto 55mm f/1.4 DA* SDM Autofocus Lens for Digital SLR

BH #PE5514DA • MFR #21790
Pentax Telephoto 55mm f/1.4 DA* SDM Autofocus Lens for Digital SLR
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Pentax DA* 55mm f/1.4 SDM Overview

The Pentax 55mm f/1.4 DA* SDM Autofocus Lens is a compact and bright short-telephoto lens of the highest order, made exclusively for Pentax digital SLR cameras.  In a stocky housing ready for harsh conditions, you'll get a bright f/1.4 aperture-worlds away from the experience you're used to with more common zooms-that opens up new creative doors to you as a photographer.

This lens was born to shoot between f/1.4 and f/2.8, and comes with a 9-bladed aperture diaphragm which shows up as perfectly round when you stay between f/1.4-2.8.  Shoot dramatic portraits with bright point light sources behind the subject, and you'll be dazzled with lovely diffuse, circular out-of-focus highlights that make everybody look better.  Beyond portraits, this lens works well any time you would use a moderate telephoto focal length.

The focusing system of this lens is SDM only; there is no screw on the rear of the lens barrel to have the AF driven by a body-based motor.  This allows the lens to move incredibly quick, driven by an internal motor and with the Quick-Shift system providing manual override capacity to you any time you want it with no buttons to switch; but you'll need a Pentax body which allows SDM autofocus (all current Pentax bodies support SDM, but the *IST series does not).

Does NOT provide autofocus upon non-SDM-enabled Pentax cameras.
Brilliantly-sharp portrait lens which gathers plenty of light
Completely-rounded aperture diaphragm from f/1.4-2.8 for beautiful out-of-focus highlights
Speedy SDM autofocus motor provides fast, silent response with Quick-Shift full-time manual override
Pentax's unique SP water and dirt-repelling coating on both external surfaces
Pentax's "Aero Bright" internal lens yields high transmissivity and reduced flare
Dust and moisture-resistant housing
Essentially equivalent to an 82.5mm f/1.4 lens upon 35mm SLR cameras

Pentax DA* 55mm f/1.4 SDM Specs

Focal Length
55mm (35mm Equivalent: 82.5mm)
Maximum Aperture
Minimum Aperture
Lens Mount
Pentax K
Lens Format Coverage
Angle of View
Minimum Focus Distance
1.48' / 45 cm
Maximum Magnification
Optical Design
9 Elements in 8 Groups
Diaphragm Blades
Focus Type
Image Stabilization
Filter Size
58 mm (Front)
Dimensions (ø x L)
2.8 x 2.6" / 7.11 x 6.6 cm
13.23 oz / 375 g
Packaging Info
Package Weight
1.395 lb
Box Dimensions (LxWxH)
5.8 x 4.65 x 4.4"

Pentax DA* 55mm f/1.4 SDM Reviews

See any errors on this page? Let us know


Would this lens work with the NEW Pentax FULL FRAME K1?
Asked by: Maria H.
Yes it will. Pentax even has an example photo shown on their website using this lens.
Answered by: Kristi C.
Date published: 2018-08-27


did anyone have back focusing problem?
Asked by: Cenk A.
I havent experienced any issues with this lens when using a K3
Answered by: Anonymous
Date published: 2021-12-28


does this lense work on a pentax 645D Medium Format DLSR?
Asked by: Anonymous
No, this is not even technically a full frame 35mm lens. This lens is part of Pentax's performance series of APS-C sized sensor lenses. It isn't even the same mount for the 645 series.
Answered by: David K.
Date published: 2018-08-27


would this lense work on my Pentax 645D Medium Format DSLR camera?
Asked by: Anonymous
Answered by: QUYET L.
Date published: 2018-08-27
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