Canon's original version of their $50 cheap camera had a metal mount, but to appease buyers, they switched to a plastic one. They were indistinguishable from one another optically and mechanically; however, they made a creaking sound when focusing and frequently missed their mark because of backlashes. Yet, the plastic lens won out as the "popular" option, allowing users to capture clear images with pleasing blur (on the off chance that the lens didn't malfunction) for around a hundred dollars. Engineers from Canon have fixed the issues. Like the 40mm STM, the focusing mechanism has undergone a complete makeover. The new lens no longer regularly misses its target, no longer squeals when focusing, and its metal mount is back. Nothing has changed visually. Nothing has changed except that there are now more appropriate frames from which to choose. Furthermore, newer cameras that are well-versed in STM motor usage are better suited for video recording. To replace the old EF50 version II, which frequently failed to focus when using contrast autofocus and howled wildly past the target multiple times, which was quite bothersome, I purchased the EF50 STM for my EOS M in order to have a cheap and compact portrait lens. Interestingly, I did not experience this issue with the same EF40, so I went out and bought a brand new EF50 STM, which did not let me down. As a worthy successor to the classic EF50 F1.8 II, I found the lens to be rather satisfying. Because of its small size, the EF-M mount required the use of an adapter, thus we had to make do with its limitations. Thankfully, with the introduction of the EF50 STM, that has all changed. However, the lens is no longer inexpensive. If you don't have a compact camera like the EOS M M2, M3, or 100D, but rather a regular-sized DSLR, then you should definitely try the EF50 F1.4 from Canon or Sigma to make sure, in the correct option, as its price has come close to the more expensive EF50 F1.4.
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