Are lenses known as screw drivers actually available?
If so what are their features and why are they called so.
Name some of the lens and their manufactures.
Answer
That's "screw drive", and it's the type of lens driven by an autofocus motor in the camera body. The link between the body and the lens is very like that between a screwdriver and a screw. Most of the older AF Nikkors, Minolta As/Sony αs and Pentax AF lenses use that drive system. Newer lenses tend to have their own autofocus motors and are driven by the body electrically rather than mechanically. The Canon EF mount has always had in-lens focus motors.
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