So I did my first wedding reception at the weekend having recently upgraded from a 450d to a 5D mkiii. The outside shots were fine but indoors, using the 24-105 lens I shot in Av priority and found that the ISO I needed to shoot at around 1/100 was 6400. I thought this would be fine with the 5D but getting the pictures home and zooming in, they are pretty noisey and not particularly sharp. I know I can clear a lot of the noise up in Lightroom but I am a little bit disappointed at how soft some of them are. Is this simply because I’m limited with the speed of my lens or are there any techniques I can use to improve the quality in future?