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50mm 1.8 STM AF Noise... Really?!

Started Jan 22, 2018 | Discussions thread
Steve Balcombe Forum Pro • Posts: 15,582
Re: 50mm 1.8 STM AF Noise... Really?!
2

XeroJay wrote:

I just picked up a 50mm 1.8 STM for my EOS M6, since I just gave away my trusty old 50mm 1.4 to one of my assistants. I was thinking that the 1.8 STM AF would be a better fit for the M6, since canon claims the STM motor is smooth and silent...

Have a look at the video here, and please let me know if this is "smooth & silent" : 50mm 1.8 STM AF Noise

Is this normal for this lens?! I have the 22mm EF-M, and it literally is smooth and silent, but the 50mm seems anything but. It also feels extremely slow.

I don't have any personal experience of it so I can't comment on whether it's normal for that lens. However there are two types of STM mechanism, "lead screw STM" which is used in the STM zoom lenses, and gear-type STM which is used in the shorter lenses where lead screw STM wouldn't fit. See https://www.canon.co.uk/lenses/tech-guide/focusing/ - doesn't give a lot of information, just the basics, but the animations (Flash required) illustrate the mechanisms quite nicely.

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