While the Canon EOS 5Ds review
has been my highest priority, the Canon EF 50mm f/1.8 STM Lens review
has not been derailed and is also approaching completion.
One of the biggest differences between the 50mm f/1.8 II
and the 50mm f/1.8 STM lenses, as their names imply, is the AF system implementation and the audibility differences of these systems is especially notable. The 50mm f/1.8 STM's focusing sound is greatly improved/reduced over the 50mm f/1.8 II presence-announcing buzz.
While much can be discerned from this post's image (the STM lens AF sound is depicted on the left), the difference that really matters will best be determined by your ears (turn up your speaker volume): Canon 50mm f/1.8 STM Lens AF Sound Compared to f/1.8 II
The perfect lens AF sound would of course be a flat line, but ... AF moves parts and moving parts tend to make at least some noise. In this case, the STM is audible and audible enough for on-camera mics to pick up. The sounds in this example are from an identical near full extents change in both directions at full speed. As with some other STM lenses, a slow change in focus distance (such as when recording video) results in a noticeably quieter sound.
Much more to come.
The EF 50mm f/1.8 STM Lens
, Canon's least expensive lens, is in stock at B&H