Digital Photography Review on MSN

Cracking the Canon code: what letters like VCM, RF-S and DO tell you about your lens

USM stands for Ultrasonic Autofocus Motor. These lenses offer manual focus override and fast, smooth and comparatively quiet ...
Digital Photography Review on MSN

What happens when your new lens is a dud? Real advice from photographers

For last week's Question of the Week, we wondered what our community does with bad copies of lenses. Here's what you all had ...