kinda what i also wanna know is On a 18-55mm lens F/3.5-5.6 = can u still go below like 1.2 F and above like say 32 F on those lenses tough it describes as 3.5-5.6F?
No. The F/3.5-5.6 is the maximum aperture for that lens. The maximum aperture gets smaller as you zoom in (3.5 at 18mm until you get to 55mm when the max is 5.6.) If you wanted an f/1.2 aperture you'd need to have your finances with a cherry on top
. At the other end of the aperture scale (the larger numbers which mean smaller apertures) most lenses will let you close the aperture to f/22 of f/32. However, this is not something to worry about too much as it is usually a bad idea to use a small aperture as the image can lose sharpness - (Have a look at Cambridge in Colour's page about diffraction
if you want more info on that.)
So I hope that clears it up.
Any other questions, feel free to ask.
Canon EOS 40D / EF-S 17-85mm IS / EF 50mm f/1.8 / My Flickr