Yo, I am looking to get a 50mm lens for my D80. Suprise, the usual deal - I don't know which to buy ha. Can anyone offer their opinion? Obviously I don't want to spend loads, but basically I want a really decent quality/price compromise. I guess my budget would be £300, but I could stretch maybe... I dunno. I've been told that Sigma are good, but I don't know anything further than that. Also would I be right in thinking that the difference between a fixed focal length 50mm lens and a 18-70mm lens zoomed in at 50mm is the aperture capabilities?