Your 18-70 isn't a bad lens. In fact as a 27-105mm (35mm FF format)it takes you from a relatively wide angle to medium telephoto. The only concern might be the speed of the lens. I.e. aperture. Being that the Sony has in camera stabilization and will allow you to shoot up to 3 stops slower than a camera without a stabilized lens or body, you do compensate for the minimal aperture available on your kit lens. Which is called a "Slow Lens". However, if you wish to really blur the background a lot, a faster larger aperture lens might be a good investment. I would look at the Tamron's, Tokina's and Sigma's that go from 16,17,18 to 50,70 mm at f2.8, which blows out the background quite a bit more than your kit lens does.
Last edited by Benjamin Kanarek; 28-07-09 at 23:55.
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