http://www.nikonchat.com/sigma-nikon-70-300/

Nikon D60 with Sigma lens?
Recently I bought a D60 kit 18-55mm lens. I'm thinking about buying a telephoto lens, but I'm on a tight budget. I saw two lenses Sigma Amazon. One is a General 70-300 and the other is a 70-300 APO DG what is the difference between these two models? The APO model has a price of 50 dollars. What i go for?
APO is a lens.It better prevent the reflection within the lens that creates "ghosting" (Inverted light ghostly shadow that appers in the picture), which is usually evident in nightshots. During the day APO lenses decrease Fuzzys "purple" (aberration color) you see in high contrast against (like the wings of a bird in the sky). Anon APO version of this lens, which is a little cheaper, but not worth it. http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http% 3A% 2F%%%% 2Fwww.amazon.com 3DUTF8% 2Fs 3Fie 26ref% 255F% 3Dnb%%% keywords 255Fss 26field-3Dsigma 252070-300 2520for%%%%%% 26url 2520nikon 3Dsearch-alias 253Daps & Tag = ad107-20 and linkCode = UR2 and camp = 1789 creative = 390 957
Sigma 70-300mm APO DG Focus Speed