SarahAllman wrote:Thanks!! I think I'm gonna go for the 105mm Nikon, it's expensive but I think it'll definitely be worth it!
The 105 f/2.8G Nikon macro lens is a very good lens, but also very big on a camera body like the D3100.
Sigma, Tamron, Tokina, all of them offer very good quality Nikon compatible macro lenses with a similar focal length and their prices are lower than the Nikon. But just because they are cheaper does not mean their image quality is also lower, the differences in image quality is hardly noticeable.
But before you buy the 105mm Nikon lens or any macro lens, check out this link: http://craftandvision.com/
They just released a new E-Book called 'Up Close'. A very good read for macro photographers, especially for those starting out.