Brushy wrote in post #18642649
The 50 1.8 is good then? It’s obviously super inexpensive but I don’t want to sacrifice a tonne on image quality or anything.
Canon has made at least 3 50mm f/1.8 lenses. The original OK, had metal mount, and noisy, slow AF. The version II was optically better, but plastic mount, and quieter, but still slow AF. Both of them struggled with AF accuracy.
Enter the STM. It is the same GLASS as the II, but with better/upgraded coating. It also has an entirely new AF system: STM. STM is designed for video, and is 'focus-by-wire'. The focus ring does NOT directly control the focus mechanism; that is done by the electronics. Some like it, some hate it, most don't mind. I don't even notice it, since I never (hardly?) use manual focus. Additionally, the STM version has 7 aperture blades; the older versions only had 5. One more good thing: the STM appears to be able to focus well, accurately, and repeatedly.
I tried at least one 50 1.4, had the original 1.8, tried at least 3 copies of the II, and still have the STM. Why? Because it works.