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Forum: Pentax SLR Lens Discussion
09-17-2018, 01:03 PM
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SDM is a type of motor, not a motor and gears model.
One SDM motor can be as different from another SDM as night and day, and in fact they might be made by completely different supplier with completely different materials.
As I understand, the issues with early lenses was more because the motors and gears were underengineered and could not deal with the weight and friction of the elements they are moving, especially if the lens hasn't been used in a while and things start to get "sticky".
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