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    KENKO RINGS

    I have a set of KENKO macro rings (12, 20 and 36mm). I tried to use them with my EOS 5D MK IV, but I got a message that the contacts need cleaning. These worked perfectly with earlier versions of EOS5D (MK I and II) and have sparkling clean contacts. Is there a change in MK IV that does not allow the rings to communicate data?
    Vasilis
    EOS 5D MK IV, EF 50/f1.4, EF 100/f2.8 Macro, EF20/f2.8, EF24-105/f4L IS, EF 100-400/f4.5-5.6 L IS, TS-E24/f3.5L, EF 75-300/f4-5.6, Canon Extender EF 2X II, Sigma 12-24mm/f4.4-5.6.
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