Product Overview

The Pentax FA 50mm f/1.4 is a classic fast prime that earns its keep the moment the light drops. On full-frame it gives you that natural, human-eye perspective; on APS-C it tightens up into a flattering short tele for portraits. The f/1.4 aperture is the real drawcard here – it lets you keep shutter speeds up in dim pubs, night streets or indoor events, while serving up shallow depth of field and smooth, creamy bokeh that makes subjects pop.

Optically you’re looking at a proven 7-element, 6-group design with Pentax’s Super Multi-Coating to keep contrast high and flare in check. Autofocus is driven by the screw-drive motor in the body, so it’s simple, reliable and fully compatible with Pentax film bodies and modern DSLRs. The aperture ring with ‘A’ setting means it plays nicely with everything from old-school K-mount film cameras through to current digital rigs. It focuses down to 0.45 m with 0.15x magnification, weighs just 220 g, and takes compact 49 mm filters – easy to throw in the bag and forget until you need it.

In the field, this lens is a versatile workhorse: a walk-around fifty on full-frame, a portrait specialist on APS-C, and a go-to option for low-light shooting when you don’t want to drag a zoom. It’s not weather sealed and the screw-drive AF isn’t whisper-quiet, but it’s tough enough for regular use and delivers the kind of character and rendering that keeps Pentax shooters coming back to it decade after decade.

Key Features

• Fast f/1.4 maximum aperture delivers bright viewing and excellent low-light performance, helping you capture sharp images in dim conditions.
• Standard 50mm focal length on full-frame and 75mm equivalent on APS-C provides a natural perspective ideal for portraits, street and everyday shooting.
• Super Multi-Coating (SMC) reduces flare and ghosting, improving contrast and colour fidelity when shooting backlit scenes or strong light sources.
• 8-blade automatic diaphragm produces smooth, pleasing bokeh, enhancing subject separation and background blur for creative depth-of-field control.
• Compact, lightweight design (around 220 g) with a metal mount makes the lens easy to carry all day while maintaining solid durability.
• Pentax KAF mount with screw-drive autofocus offers full compatibility with Pentax film SLRs and DSLRs, ensuring reliable focusing across camera generations.
• Minimum focus distance of 0.45 m and 0.15x magnification allow for tight close-ups and detail shots without changing lenses.
• Physical aperture ring with ‘A’ setting gives flexible control, whether you prefer camera-based exposure automation or manual aperture adjustment.
• 49 mm filter thread supports common filters and hoods, making it simple to add protection or creative effects to your setup.
• Distance and depth-of-field scales on the barrel assist with zone focusing and pre-focus techniques, useful for street and documentary photography.