Time to be with your loved ones

Time to be with loved ones

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6
votes
1answer
431 views

What is Power Focus on a Canon lens?

A few of the most recent Canon telephoto lenses a feature called "Power Focus" or PF. What is the purpose of the setting and does it benefit photography at all? I have found the following lenses ...
8
votes
3answers
13k views

What is USM, and what are its pros and cons?

My Canon lenses have the designation USM on them, which I assume is for the same reason that they say "Ultrasonic". What does this mean, and why or why do I not want it?