[kailewjay]

I've just upgraded from my Panasonic Bridge camera to a D3100 with a stock 18-55 lens.

I mainly shoot amateur rugby league so I'm looking to buy a zoom lens.

Budget's not massive but I'm not sure whether to go for a 50-200 or 70-300, am I correct in thinking that the D3100 has a magnification factor of 1.5 so these sizes will increase?

Thanks in advance.