https://community.usa.canon.com/t5/EF-RF-Lenses/Parameters-of-the-UltraSonic-Motor-of-lens/m-p/383385#M23495 <P>You could turn IS off and use a sensitive microphone. However, the time will be variable since the autofocus is a pretty complicated feedback loop.</P> Thu, 25 Aug 2022 12:37:06 GMT kvbarkley 2022-08-25T12:37:06Z https://community.usa.canon.com/t5/EF-RF-Lenses/Parameters-of-the-UltraSonic-Motor-of-lens/m-p/383375#M23492 <P>Hi everyone,&nbsp; I'm a researcher from the university.&nbsp; In my study, we ued two&nbsp;SLR lens with Ultrasonic Motor for imaging (f=50/1.4 and f=100/2.8).</P><P>Recently one reviewer of our paper ask us to compare our new technique with the focusing speed of the USM of the lens.&nbsp;(i.e. for a 50/1.4 lens, the delay time after we send the command and before the lens arrives the position and stop). Does anyone have some idea on how I can get those parameters?&nbsp;&nbsp;</P><P>Thank you!</P><P>&nbsp;</P><P>&nbsp;</P> Thu, 25 Aug 2022 04:43:13 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/Parameters-of-the-UltraSonic-Motor-of-lens/m-p/383375#M23492 250440836 2022-08-25T04:43:13Z https://community.usa.canon.com/t5/EF-RF-Lenses/Parameters-of-the-UltraSonic-Motor-of-lens/m-p/383385#M23495 <P>You could turn IS off and use a sensitive microphone. However, the time will be variable since the autofocus is a pretty complicated feedback loop.</P> Thu, 25 Aug 2022 12:37:06 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/Parameters-of-the-UltraSonic-Motor-of-lens/m-p/383385#M23495 kvbarkley 2022-08-25T12:37:06Z