ahhh! so frustrated. i finally decided on the 50mm f/1.8 lens for my nikon, as my first lens [besides the kit one...] oh wait. AF. not AF-S. no auto-focus?!? does anyone have this lens for the nikon d60? how is it manually focusing? i don't know if i can handle it! and if i can't, i don't even know where to look now! HELP!