Results 1 to 4 of 4

Thread: Ring USM and Ultrasonic

  1. #1
    Member
    Join Date
    Nov 2003
    Location
    Bedok
    Posts
    280

    Default Ring USM and Ultrasonic

    Hi,

    What is the different for the above 2 focus drive term that use in canon lens?

  2. #2

    Default Re: Ring USM and Ultrasonic

    Check the stickies in the Canon forum category, or Wikipedia.
    Alpha

  3. #3
    Senior Member
    Join Date
    Jul 2006
    Location
    Clementi
    Posts
    10,597

    Default Re: Ring USM and Ultrasonic

    USM stands for Ultrasonic Motor.

    Ring USM is a subset of USM technology; it is one of the few kinds of USM that Canon has developed.

  4. #4
    Member Shin Howard's Avatar
    Join Date
    Feb 2008
    Location
    North Eastern Region
    Posts
    1,061

    Default Re: Ring USM and Ultrasonic

    USM = Ultrasonic Motor
    I think you meant the Ring USM & the Micro USM

    http://www.canon.com/technology/cano...ation/usm.html
    I'm looking at a different perpective of life.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •