So shooting for the newspaper, portraits, wildlife, real estate, architectural, and macro doesnt count? ic. I like it when you don't have anything to say and have to resort to ad hominem ^^

I don't see a difference in where I've focused.

All it does is extend the focal plane slightly (which will change the shot)

Do some experiments with heavily contrasted and total black subjects.

From photo websites:

"Use the lens' optimum aperture. This is typically not with the lens wide open, and never when stopped all the way down. Only the finest lenses are as sharp wide-open as when closed down]somewhat, and no lens is at its best when stopped down to f/22 or f/32, due to diffraction effects. Most lenses have their optimum aperture at 2-3 stops down from wide open."

"In nearly all instances, the widest possible aperture will not generate the maximum sharpness and contrast that the lens is capable of. (Keep in mind that some high-end super-telephoto lenses are designed to provide outstanding performance wide-open, and you may see little improvement in stopping down.) "

http://www.usa.canon.com/dlc/controller?act=GetArticleAct&articleID=1386

Maybe I should have said 'most' instead of all, but the 24-70 and the 24-105 are included.

This post was edited by onepagememory on May 9 2010 07:34am