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Respecto a los comentarios de la montura, entiendo que Pentax K (conocida en adapatadores como PK) y Pentax KA son distintas (¿?).
Our favorite inexpensive ultra-wide lens. Manual focus, aperture adjustable only in full stops, and not particularly fast -- but you don't really need speed in a 19mm lens, since you can safely shoot handheld with them at 1/15 or 1/20 second.It was made in six different mounts (Pentax K/A, Yashica/Contax, Olympus OM, Minolta MD, Nikon AI-S, Canon FD).