The Asahi SMC 135mm f/2.5 is a lens from the manufacturer Pentax. The factory where the lens was built was located in Japan. It can be used on cameras with a Pentax K mount.
The focal length of 135 mm cannot be changed as it is a prime lens. It belongs to the group of telephoto lenses. The maximum aperture of the lens is f/2.5. The minimum aperture is f/32.
This lens does not have autofocus; focus is adjusted manually. To have the subject in focus, you must keep a distance of at least 150 cm from the subject.
The Asahi SMC 135mm f/2.5 is constructed from 6 elements in 6 groups. A 58 mm filter, e.g., an orange filter, can be attached in front of the lens. The weight of the lens is 500 grams.
