Autofocus stays on in MF mode

Discussion in 'Beginner Questions' started by Mark H, Jun 21, 2020.

  1. Mark H

    Mark H New Member

    Joined:
    Jun 21, 2020
    Messages:
    1
    Equipment:
    Canon 70D
    Canon 24-105L lens
    I am using a 70D with a 24-105L lens. When I switch the lens toggle switch from AF to MF, the camera still autofocuses. Have tried on One Shot, AI Focus and AI Servo modes but these make no difference - camera continues to autofocus. What am I not doing?? Or is there a fault that the camera is not reading the switch on the lens from AF to MF?
     

  2. johnsey

    johnsey Site Moderator Staff Member Site Supporter

    Joined:
    Apr 21, 2017
    Messages:
    2,120
    Location:
    Fargo, ND
    Equipment:
    5dMk4, 5dsR, 5dMk2, 20D, 70-200 2.8L IS, 100mm 2.8 Macro USM, 50mm 1.4, 85mm 1.8, 17-40mm 4.0L, TS-E 24mm 3.5L II, Rokinon 14mm 2.8; Pixma Pro-100
    The switch should only disengage the focusing motor on the lens. The camera will still give focus confirmation for the shot you take. If the lens in MF and the motor is actively moving the focus in and out as you point the lens at object of various distances then it sounds like the switch is broken and stuck in AF. I would switch it back and forth firmly a few times and see if that helps, but if the switch is broke it will require service to fix.
     
  3. Grumpy John

    Grumpy John Member

    Joined:
    Jun 10, 2020
    Messages:
    85
    Location:
    Outer SE suburbs of Melbourne
    Equipment:
    EOS 7D MkII
    EOS R6
    Canon RF16
    Canon RF85
    Canon RF24-240
    Canon EF 50
    Canon EF 85
    Sigma 150-600mm 5.0-6.3
    Tamron 28-300
    Canon Speedlite 580EXII
    Yongnuo YN14EX Ring Flash
    It sounds like the switch on the lens could be faulty.
    Try a couple of fault finding techniques:
    1: try a different lens on the camera, see if the AF/MF function is working properly.
    2: if you have another body, or can borrow one, try the 24-105 lens on that body.
    If you use these fault finding techniques you will be able to see if the problem lies with the lens, or camera body.
     

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