Pentax HD FA 43mm f/1.9 Limited

The Pentax HD FA 43mm f/1.9 Limited is a full-frame prime for the Pentax K mount. Its 43mm focal length gives a near-normal view, framing slightly wider than a classic standard lens. That makes it a natural fit for street, travel and everyday photography. Pentax released this HD version in 2021.

The trade-off is a short feature list. There is no weather sealing and no image stabilization, and the close focus sits at 1.5 ft (45 cm). In return, the lens stays small and light, with a bright f/1.9 opening. It suits photographers who prefer one compact prime over a long specification sheet.

At 5.5 oz (155 g), the lens is light enough to carry all day on the camera. It measures 2.52 in (64 mm) across and 1.06 in (27 mm) long, so it projects little beyond the mount.

A screw-in filter attached directly must match its 49mm thread. The physical score is 93 out of 100.

The 43mm focal length gives a near-normal perspective. It frames people with a sense of the place around them, which suits reportage, street scenes and environmental portraits. Indoors, it takes in a table or a small group without crowding. Fixed at one length, the lens encourages moving with your subject rather than zooming from a spot.

The f/1.9 maximum aperture is the main optical strength. It admits enough light for indoor rooms and evening streets while keeping shutter speeds usable. At portrait distance it separates a face from its background, though the effect stays gentler than a longer lens would give. Depth of field at f/1.9 is thin, so precise focus on the eye matters.

The aperture uses 8 blades. Stopped to middle settings, the opening remains close to round, which keeps out-of-focus highlights smooth instead of clearly cut into shapes.

Closest focus is 1.5 ft (45 cm). That gives working room for people, groups and general scenes. The optics score is 83 out of 100.

The features list is short. A fluorine coating on the front element helps water and oil slide off, so the glass wipes clean easily after rain spots or fingerprints. The coating covers the glass surface only and does not seal the lens.

There is no built-in image stabilization. At 43mm many handheld shots remain steady at moderate shutter speeds, so the omission costs less here than it would on a long telephoto. For slower speeds, a steady grip or a support helps keep the frame sharp.

The lens also has no weather sealing, so it is best kept out of rain and blowing dust. The features score is 39 out of 100.

The optical design uses seven elements in six groups, a simple layout that suits the slim barrel. It relies on conventional glass types, with no aspherical or low-dispersion elements. Focus is internal, so elements move within the barrel and the lens keeps its length while focusing. The construction score is 23 out of 100.