Hi to everyone, That's my first post in apug forum and I haven't searched for threads like this one, so I apologise if there are the same threads. I am looking for 28mm(f2 - 2,8) lens for my Nikon FM and I found that Nikon AIS 28mm is really nice and high qualited lens, but I'd like to know about Tokina/ Sigma/ Vivitar 28mm manual focus lenses. As I've been scrolling down the google found some sample photos made with Tokina 28mm f2,8 and it seems to be not sharp enough. What about Sigma 28mm F2.8 Mini-Wide and Vivitar 28mm f2,8 ? I'd like to buy a sharp, nice contrast lens, so could anybody help me to chose ?