I don't have a full understanding of why certain lenses are meant for full frame sensors.


I just thought that the 24-105 was a better range for general purpose. It really is out of my price range right now.


I thought Sigma was thinking the same thing when they came up with the 18-125 f3-f5.6 OS but I think the slowAF will bother me on that lens.


I guess I wish there was an affordable 17- 135 f/4 IS USM lens for general purpose.


One more question, the 40D comes with two different kit lenses, is the 18-55 ISbetter than the 28-135 IS?


As of right now, option 1 or 2 will best. I should have a decent amount of flexibility. I just know that I'm a perfectionist and could easily be discouraged if IQ problems are a result of the equipment rather than my inexperience.


Thanks everyone for sharing your thoughts.