I just bought a Lumix S5II because the guy at the store said it was good but now I am totally lost with the lenses. I have my sister's wedding coming up in about two months and she wants me to take some fancy portraits of her but I only have the kit lens and it doesnt look like those blurry background shots you see online. I have been looking at the Sigma Art ones because everyone says they are the best for the L-mount thing but there are so many numbers and I dont get what they mean. 35mm? 50mm? 85mm? My budget is right around $1000 and I am really scared of buying the wrong thing and ruining her big day. We live in a small town in Oregon so there isnt a shop I can just go to and try them out myself.

I keep reading about f1.4 and f2.8 and my head is spinning trying to figure out the difference. Is 85 better than 50 for people? I want that really smooth blurry look for her photos but I am worried 85 might be too zoomed in if we are inside the church or something. Does one work better for a total beginner who has no idea what they are doing? I really need to know which one I should buy so I dont mess this up...