I have 2 questions that im stuck on and cant really firgure it out. 1) What would be a good lens for shooting in low light/night settings. Camera is a Sony alpha a300 2) The new lens i just bought is a Tamron 70-300mm with macro. When i set it to macro it has to be between 200-300 zoom, and i cant seem to get it to focus on a object close up, and i cant get that clear up close detailed picture. Any ideas why? Here is the link to the lens for more details about it. If that helps any. AF70-300mm F/4-5.6 Di LD Macro Zoom; Tamron USA, Inc.