Probably no lens runs a wider price range than the 50mm. You can pick up a new wide-aperture 50mm prime for anywhere from under $100 to well over $2,000 and just about everywhere in between. The most affordable options tend to have some serious limitations, though. The Viltrox AF 50mm f/1.8 offers an upgrade over those cheap models without breaking the bank, and this great video review takes a look at the image quality and performance you can expect from it.