I do mostly audio recording, but people often ask for video and photography and as an entrepreneur (i.e. person without a guaranteed salary) I can't say no. After much research, I invested in a Sigma 30mm F/1.4 lens. It has probably paid itself 1000 times over. The lens itself was probably one of the best investments I've ever made.
The information you provide here is priceless :).
Aye, that one sounds really cool. At F 1.4 you have almost no loss of light at all. It's almost as the eye can see it. That would be F 1.