Hi, I realised I might get a flaming for such a common question! I am a newbie to photography and like to shoot the events I design (Stage Lighting). I have found my kit lens to be insufficient in low light to get a fast enough shutter speed without ramping up the iso massively (Canon 1000D iso 1600). I have considered the 'nifty fifty' both the 1.8 and 1.4. I have tried shooting at this focal length and find it limiting at times (when I have no chance to move around without being obtrusive to the audiences view or distracting the performers). Ideally a telephoto lens in and around the standard kit lens (18-55) but I would like the IS function also. What aperture should I be looking at? 2.8? 1.8? Is 1.8 achievable in a zoom? My budget will be around £300-500(Maximum). I might be asking alot for to little but I thought it would be worth a shot! Thanks in advance!