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Thanks to the person who posted that piece of information regarding Canon lens focusing.It took time and concern. But, I do not know how to apply it. I do not interpret writings well where I can't define half the vocabulary used. All is want is a lens that works. I read on another forum (dpreview.com) many people have this backfocus problem with 70-200 f4L lens and others. I was planning to buy a 20D, 17-40L and the 70-200L this week. But now I am having second and third thoughts. I do not want to spend about $2500, not including filters,...Show more →
There are nowhere near as many problems in practical usage as the complaints in the forums would have you think.
Proportionately, I don't see any fewer problems in the Nikon forums. If you'll notice, the Canon forums always have two or more times more traffic than Nikon forums--which means you'll see two to three times more complaints in absolute numbers.
Moreover, the Internet "lens effect" makes everything seem bigger than it really is. Happy people are taking pictures; unhappy people are complaining. And they tend to complain repeatedly, so you see the same single complaint repeated in many topics and over several forums.
One of the problems Canon faces with being the marketing leader is that they also have a lot more inexperienced people (for instance, Canon sells cameras in Wal-Mart--Nikon doesn't) so there are a lot more people who will have problems. A lot of those people also have computers.
Much of the complaints are because people are "pixel peeping" instead of printing. The focusing system is designed to produce a good 6x9 print viewed at 10 inches. Most people who complain are looking at their images enlarged to 40x60 and viewing it at 10 inches. Of COURSE they will see problems--the system is not designed to be that accurate. But print out a picture to your normal size and see if you have a problem. People still shooting film aren't having all these problems because they judge the system based on the prints they make.
Then there is the final factor: Automatic focusing actually takes some skill to use. Not much skill, but what is necessary is necessary. People have to do some practicing and some exercises to find out just how the system works and how to make it do what they want it it to do.