Budget Chinon fast standard prime for Pentax K-mount, f/1.9 aperture at the cheapest possible price.
The Chinon 50mm f/1.9 is a fast standard prime in Pentax K-mount produced by Chinon as an affordable alternative to genuine Pentax 50mm lenses. The f/1.9 aperture provides a bright viewfinder and useful depth-of-field control, sitting between the common f/2 and f/1.7 specifications offered by other manufacturers.
Optically, the lens delivers good central sharpness with pleasant rendering characteristics. The unusual f/1.9 maximum aperture provides nearly the same light-gathering ability as f/1.8 lenses while the slightly different optical design may produce subtly different rendering character that some photographers find appealing.
Build quality is functional Chinon standard with a metal mount and adequate barrel construction. The lens is compact and lightweight, handling well on Pentax K-mount bodies. The smooth focusing ring provides acceptable manual focus precision for everyday shooting.
The Chinon 50mm f/1.9 is among the cheapest fast standard primes available for Pentax K-mount on the used market. While it lacks the Pentax SMC coating advantage, it provides fast aperture capability at a fraction of the cost of genuine Pentax alternatives.