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Introduction

Pentax smc FA 43mm f/1.9 Limited is one of the only four FA lenses from the company's film era that are still being manufactured and sold nowadays. The lens was the first one to bear 'Limited' designation and despite its rather high price tag, ~US$500, remained quite popular among users. But but the general sense in the Pentax community is that with the introduction of Pentax smc DA 40mm f/2.8 Limited and switch towards SDM type lenses, the days of the smc FA 43mm f/1.9 are numbered.

The optical construction of the lens consists of 6 elements in 7 groups. Like all pancake lenses, the smc FA 43mm f/1.9 Limited is quite small and light, measuring 63 x 27mm (2.5 x 1.1in) and weighing only 156g (5.5oz). The build quality of the lens is excellent, with metal barrel and aperture/focusing rings. That's right, like all FA lenses, the smc FA 43mm f/1.9 has a dedicated aperture ring, which allows you to stop down the lens manually, although the lens also supports fully automatic, through the camera, diaphragm control, assuming you lock the aperture ring into the 'A' position. The focusing ring rotates from f/1.9 through f/22 in one full f-stop increments. The lens supports both manual as well as automatic focusing, although since there is no dedicated AF motor in the lens itself, the auto-focusing is done using camera's drive pin that locks into a dedicated slot on the base of the lens mount.

Since Pentax smc FA 43mm f/1.9 Limited is a traditional 35mm lens, when used on APS-C type cameras with 1.5x crop factor, the field view of the lens will resemble that of a 64mm prime on a full frame body. Since the lens allows for a fully manual operation, using dedicated aperture and focusing rings, it can in theory be adapted to alternative mount cameras. Particularly, you should experience no problems using this lens on Four Thirds or better yet Micro Four Thirds systems from Olympus and Panasonic. Adapting the lens to Canon EF/EF-S mount is also theoretically possible,although there is a danger that the Canon's mirrior will not clear  the aperture coupling prong of the lens. Be careful when experimenting.

 

Summary
Lens Composition 6 elements in 7 groups
Angular Field 53 degrees
Minimum Focus 45cm/1.5ft
Focusing Action AF/MF
f-stop Scale f/1.9-f/22, manual/electronic
Filter Size 49mm
Lens Hood N/A
Weight 156g/5.5oz
Dimensions 63x27mm/2.5x1.1"
Lens Case N/A