Yes, Canon has identified a specific malfunction in some EF 50mm f/1.4 USM lenses, where the focus operation stops when moving from infinity to a closer distance, affecting both autofocus and manual focus. Other reports mention issues with softness at wide apertures, difficulty achieving sharp images, and even focus motor failure over time, leading some users to consider it a fragile lens with a reputation for poor quality control or a tendency to fail. (Canon Community Forum) btw, Made in Japan ? A widely held distinction which increases values, ... debunked. I have one I bought in a kit with a 5D and a 24-105L, I'm thinking it's been used less than 100 shots total. I tried to sell it and it's like new, couldn't even get $100 so it collects age because? Where am I going to get AF 1.4 for less than $100 that communicates Canon on Canon? It's original manual lens purpose was to be the color reference standard for the Canon system. People with good copies don't really comment, all that's mainly heard is bad experiences. Forums are all about da gripe, not da praise is my point here with some facts to back it up .... it's all about dreaming what it will be like going to a big amusement park for the first time and then after that it's all downhill ...the complaints grow and the happy are not on Forms whining like it's a self-support group for remorseful buyers. Really, if something is great then the last place I'd be is on a forum reading, I'd be so delighted I'd wear out a shutter in a day ....thanks for helping me break out of my block and helping me use my eyes and not my thoughts again ..."gone shooting" I appreciate your assistance in this matter very much ....stop thinking , what a concept?