Is there any appreciable improvement using a quad core? I've heard some folks say that it might be more unstable than a dual core. Not that I have any idea what a dual or quad core actually is or how they work.
ive got some specks of dust inside my lens.. is it ok for them to be there? or shud i get rid of them. how do i do so? many ideas?
Nikon D90, Tokina 12-24mm F/4, Nikkor 18-55mm VR, Nikkor 50mm 1.8, SB600