: It features a "push-pull" zoom mechanism rather than a twist ring. It is prone to "zoom creep," where the lens extends under its own weight when pointed down.
: The lens is remarkably sharp, especially in the center, even wide open. Sharpness improves significantly when stopped down to , where the corners also become crisp. canon ef 50 200
This review compares the rare L-series version of this lens to modern standards: : It features a "push-pull" zoom mechanism rather