Hi guys, I was just wondering, what happens when I put a 50mm EF lens on my 450D? Will I get the same focal length as my EF-S 18-55 set to 30mm? There's this thing with crop factor (1.6), and I don't quite get it. My dad has a 35mm camera. If he uses his 50mm lens, and I use the EF (not EF-S) 50mm lens, will I see the same thing as my dad does?