Canon lovers have long enjoyed the 50mm lens, so much so that they nicknamed it the Nifty Fifty. Over the years Canon has come out with a few variations of it. We're going to compare two of those, the Canon EF 50mm F/1.8 II , and the Canon EF 50mm F/1.8 STM . Both lenses are of course 50mm, have an aperture of 1:1.8, and lack image stabilization, so we're going to focus more on the differences between the two in this blog post. Lens mount - [Winner] Canon EF 50mm F/1.8 STM Canon EF 50mm F/1.8 STM: Metal Canon EF 50mm F/1.8 II: Plastic Starting with the painfully obvious difference between the two, the Canon EF 50mm F/1.8 STM features a metal lens mount, which means it'll hold up a lot longer when it comes to users that switch lenses on a regular basis. If you're the type that sticks with just one lens, I wouldn't consider this a deal breaker. Aperture blades - [Winner] Canon EF 50mm F/1.8 STM Canon EF 50mm F/1.8 STM: 7 blades Canon EF 50mm F/1.8 II: 5 blades