I know this question is probably asked over & over but im new to DSLR and need to know what lens i need. I shoot with a 7D, i shoot music videos, i already have a canon 50mm 1.8 when anyone here recommend shooting a whole video with only this one lens? To me it seems like i need something else for full body shots. Price is a factor i dont have much $ but i also dont want any low quality product. Any help is highly appreciated.