I'm a keen beginner with a Nikon D90 and the kit lens (18-105mm).
I now want to experiment with new lenses. I take a lot of photos of my kids and would like to get some good portraits. What would be a good lens for this and what does it offer over the kit lens? eg I never seem to get the small depth of field I would like with my existing lens, even if I fiddle with ISO and aperture/speed.
The alternative would be to go for a bigger zoom in which case which would you recommend.
Not looking for the most expensive kit around by the way! Just something that will take me to the next step. S be guided by the fact I have a D90 and not something more expensive.....