Logic dictates that the needs of the many outweigh... nevermind.
While I thoroughly enjoy the IS on my wider lenses, traditional wisdom is "the longer the lens the more it needs IS". I expect IS versions of the 50, 85, 400, and 135 by this time next year.
i don't know...considering this is supposedly the year of the lens, and canon hasn't introduced much, i doubt they'd manage to replace 4 lenses with IS versions within the next year.


