Many different lens brands will fit on your Pentax camera body.
Interchangeable lenses allow a photographer to add both diversity and versatility to their kit. Depending on the type of mount your Pentax body has -- either the M42 or the K mount -- lenses from a number of different manufacturers will fit on the front of your camera.
M42 Mount
M42 lenses use a screw-mount threading to attach to the front of a camera. Predating the more popular bayonet style mount now exclusively used on Pentax bodies and lenses, the M42 mount first appeared in 1949 on the Zeiss Contax camera. Other camera companies, including Zenit, Pentacon and Praktica, used the M42 mount and produced many M42 lenses. Although new Pentax bodies require an adapter for M42 lenses, you can use M42 lenses on a Pentax Spotmatic without an adapter.
Takumar
One of the most popular lenses among Pentax users is the M42 mount 50mm f/1.4 Super-Takumar, especially on Spotmatics. Although Takumar was a division of Asahi Pentax, it produced lenses for other camera companies as well. You can use K mount Takumar lenses of all focal lengths -- wide, normal and telephoto -- on any Pentax body.
Sigma
The Japanese lens manufacturer Sigma manufactures a significant line of K mount lenses. Most commonly used with Pentax DSLRs, Sigma lenses come equipped with precise autofocus and auto-metering functions. New Sigma lenses may be used on old K mount Pentax bodies, but autofocus and metering will not be possible.
Ricoh
Many lenses produced by Ricoh in the 1970s and 80s sport the K mount, which means they are compatible with Pentax bodies. The lenses from many Sears brand cameras, often thought to be re-branded Ricohs, are also compatible with Pentax K mount bodies.
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