@Dilbert: I refer you to Neuro's answers for all the spherical aberration stuff. Canon DOES purposely leave in spherical aberration by design, as it is a desirable effect in many circumstances.
As for your assuming, you assume that people are trying to justify what Canon does, when in actuality people are simply explaining what Canon does. You assume that people here "worship" Canon, when in fact some people are simply fans, others are simply customers and might otherwise not care about the brand. You assume a whole hell of a lot about people here man, and then you lash out at them with thinly veiled hostility and nasty words based on your INCORRECT assumptions.
All I'm saying is...might not want to assume, you would look like less of a donkey's rear end in the end.
Totally rude and unnecessary. How can a person use such words to make a point?
You might want to go through and read a couple weeks history of Dilbert's posts. Then make a determination of who's rude. Dilbert LOVES to make assumptions about people, then create little fantasies about why people write the posts they do based on those assumptions. You know what they say about people who assume, right? "When you assume, you just make an A*s*s of you and me?" Hence the donkey comment. I thought it was rather appropriate, given the whole discussion of assumptions at the time. I think everyone else got the joke.