I'm going to invest in a new camera lens for food photography. I've already worked doing this kind of photography but I've always have used a zoom lens like the Canon 24-70mm f/2.8. Now that I'm going to start doing this kind of photography again I have been reading and in many places people prefer a prime lens like the 35mm, 50mm or the 85mm for food photography. For those people doing food photography, what is your main lens for it?... What do you prefer to use?