Some of the lenses were made with internal motors and are labeled DA lenses. They seem to be backward compatible with Pentax bodies with the builtin motors. Pentax called this Supersonic Drive Motor lenses (SDM). CPAP Therapy is a way to live.
|
Some of the lenses were made with internal motors and are labeled DA lenses. They seem to be backward compatible with Pentax bodies with the builtin motors. Pentax called this Supersonic Drive Motor lenses (SDM). CPAP Therapy is a way to live.
|