What is so special about 15mm on Canon 15-85mm IS EF-S USM?

Started Mar 31, 2013 | Questions thread
William Woodruff Contributing Member • Posts: 535
Re: the difference

"with LR4 lens correction, it is the difference between having 4 stop IS and very good 24 and 28 at the wide end on crop -- and not buying 3 stop 24 f2.8 IS or 28 f2.8 IS for FF"

Huh?  MAC, I know that you are a pretty bright guy, but what in the world does LR4 correction and IS have to do with the practical difference between 15 and 17/18 mm focal length?  Is it April 1 already?

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