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What I understand is that STM is a part of lens, not camera. Canon 3000D or 1500D makes noise while focusing. So if we buy a Canon EF-S STM lens, which is used on 200D, will it be compatible and produce less noise?

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All three of those cameras use the EF-S lens mount, so they should work with pretty much any EF-S lens. If the lens in question has an STM auto-focus motor that is noisy, mounting it on a different camera is not likely to change that, since the motor is entirely in-lens - the only role the camera body has is communicating with it via the electronic contacts in the lens-camera interface to tell it what to do.

This might be different if you had a camera with in-body autofocus motor (i.e. some Nikons and other manufacturers), but no Canon EOS model has ever had an in-body autofocus motor.

  • Maybe you missed something. Canon 200D's lens makes no noise while focusing. So my question is related to this. – Vikas Kumar Jun 13 at 17:50
  • @VikasKumar Maybe you missed something. Whether or not a lens makes noise while auto-focusing has nothing to do with the camera body. It's all up to the lens and the included auto-focus motor, regardless of which camera body it's currently attached to. – twalberg Jun 13 at 19:57
  • Maybe you missed something and not trying to realize it. If the lens in question has an STM auto-focus motor that is noisy No, it isn't noisy. So will that also work for other cameras without noise? – Vikas Kumar Jun 14 at 2:00
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    The point is that, if it's making noise, it's the lens, not the camera. So, if you attach the same lens to a different camera, it's still going to make the same noise. – twalberg Jun 14 at 4:39
  • I still don't know why you're not telling this thing in other way :( Is the converse also true? i.e., if the lens in 200D is not making noise, will it also not make noise in 1500D? – Vikas Kumar Jun 14 at 16:08

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