WthPersonally I use AI NR above ISO 800.
I don't use AI noise reduction, but I may consider a tiny bit of standard noise reduction by ISO 16k or so.
My copy of the lens was barely used and, like I mentioned, it was bought on a modern era, so I'd assume Canon had their quality control issues solved by then.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.
Also, pretty much all reviews of that lens show it as being pretty crappy wide open
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