I had the 35mm lens with my d5100 so I had to have one with a motor in it. I also got the 50mm/1.4 for $350 due to a pricing error by amazon. It's supposed to be $469 and is now. Was hard to turn down a good deal. I agree with the fx lens. All my lens had to have motors bc I just purchased the
d7100 but don't have to now.
$469 for the f1.4? Make the 50mm f1.8 at $120 sound like a real deal. It's also built well....not like it's plastic or anything. When I've shot in low light, it's amazing how bright the shot comes out.