QUOTE(tongweng @ Dec 6 2012, 10:35 PM)
thanks for everyone who explain the difference between 70 -200 fix aperture and 70 -300 variable aperture to me... just came back from dinner and i taken some shots with my kit lens. still not know how to set the correct exposure XD
very simple one...in ur viewfinder u should see something like the picture (circle in red). this thing call exposure meter, if not show go read ur manual how to get it out.

how to read this thing...u will notice that there is an indicator go left n right.
going to left -> image under exposure (dim or dark)
going to right -> image over exposure (bright)
what u need to get is the indicator stay at 0
example, the indicator now at very left side (under exposure)
in P mode, u can increase the iso (u will notice the indicator moving to right side when u increase the iso. too high will create noise)
in S mode, u can slower the shutter speed. but for movement object, too slow will make ur photo become blur. ISO also can be increase if u want to have faster shutter speed.
in A mode, u can make the F value smaller (open the aperture bigger), also can increase the iso. this highly depend what u are shooting. in some case u need bigger F value to make sure everything in focus the the only variable u can play with is only left the iso.
leave M mode at this moment

if the image is over exposure, u just do the opposite setting.
Added on December 6, 2012, 11:12 pmQUOTE(tongweng @ Dec 6 2012, 10:35 PM)
focal length is 18 X 1.5 right. mean i cant take close range picture with my lens since it cant focus. Correct me if i am wrong.

check ur lens spec online, u will notice something about this
Closest Focusing Distance - 1.48 ft. (0.45m)
this mean that u need to have at least 45cm from the object, then ur lens can focus

different lens will have different distance.
This post has been edited by ongdennis: Dec 6 2012, 11:12 PM