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I have a Canon EOS T3i 600D. When I use a Canon-branded lens (18-55mm), the camera works well. When I change to the Sigma macro 18-250mm and turn the camera on, I can hear a ringing noise, like ringing of the ear type noise. What's causing this?

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    Does the noise happen when autofocusing or all the time? – Philip Kendall Jul 15 '15 at 12:54
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    Sounds like an issue with the AF Motors in the lens - click here for a previous similar question/answer-photo.stackexchange.com/a/65416/34085 – Abdul Quraishi Jul 15 '15 at 15:35
  • All the time Philip Kendall only when i use the sigma lense its brand new. And on all functions it rings. – Giggy Jul 17 '15 at 10:42
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If the lens is similar to the Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM, it uses an ultrasonic (Hypersonic, in marketing parlance) motor for focusing. These motors can be smoother (less backlash or overshoot) than traditional electromagnet-based rotary motors, but apparently the "ultrasonic" ratcheting is not quite beyond your hearing range.

This is nothing to be concerned about if the sound is not bothersome to you. It might produce some interesting reactions in pet photography, though.

  • Makes noise all the time only with the new lense. – Giggy Jul 17 '15 at 10:36
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I believe a lot of cheaper hypersonic montors (HSM) [or USM for Canon glass] don't have great quality control and can produce that kind of noise. Likewise, I've personally had a Canon USM lens that was vibrated too much in a case emit that kind of noise, too. Your best bet would be to send the Sigma back for warranty service (or take it into a shop) to get it checked out.

As someone with sensitive ears, I can occasionally hear the whine of the motor when it's desperately trying to focus on a subject in motion, but in general, noises you don't expect right after you turn the camera on implies some kind of malfunction. Best of luck to you!

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tl;dr: I think it is the image stabilization.

Additional info: Check whether you can hear the noise on all stabilized lenses (ask a friend or check at a camera store if there is no other choice). I certainly hear the stabilizer every time it's operating on my two stabilized Nikon lenses and some more of my friends. Reading the other answers, apparently the sound is out of the hearing range for some people (or probably the most?). On Nikon lenses the stabilizer is coupled to the lightmeter, - the stabilizer is switched on and off with the lightmeter (the absolute time can be set in the menu). I am not familiar with the Canon system, but 'the internet' reports a similar feature for canon (in a different context, though):
http://www.learn.usa.canon.com/resources/articles/2014/is_lens_rattling.shtml
You may also be able to hear the click. By checking if you can hear the noise on every IS lens you can find out whether the noise is in the normal range.

  • I can hear some IS lenses but not others; in all cases I can only hear them with the trigger half-pressed and for a moment afterwards (Canon with Canon/Sigma lenses). So I don;t think this is the right answer, but the DV wasn't me. – Chris H Jan 13 '16 at 10:51
  • That moment afterwards would most likely be the time of activation which on Nikons and apparently canons is coupled to the light meter. As said before, this time can be set in the menu (6s for me). You can also clearly see the effect on a long lens, the image in the finder will start to shake more once the high-pitched noise is gone, if the noise is caused by the IS. On that we would need a response of the TO. He saws the noise is always there, so probably the light meter is set to never switch off. – kamuro Jan 14 '16 at 9:12
  • ,that makes sense. it seems to be tied to the autofocus on the canons I'm used to, which IMO makes more sense. – Chris H Jan 14 '16 at 17:59
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When I change to the Sigma macro 18-250mm and turn the camera on, I can hear a ringing noise, like ringing of the ear type noise. What's causing this?

All moving parts are located in objective: the aperture iris, the IS, the focusing motor. Whatever is broken is located in objective. And, if you hear the sound right after turning the camera on, when no moving parts are expected to move, it is natural to suggest that objective is malfunctioning in some way (you may make it more clear if you describe how well the objective works).

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