I am brand new to this so I am still trying to learn just the basics. I know that Aperture is responsible for making those beautiful focused subjects and blurry backgrounds. I am still playing with my camera to make that work, but recently I was told that my 'kit' lens 18-55 Nikkor only goes to 5.6 and to really get a nice shot I would need a 2.8 or less. Is this true? Can I not get a decent focused/blurry photo with my lens? The other lens I have is a 50-200 VR, also 5.6.