Canon 650D not working with Pentax lens

Discussion in 'Technical Troubleshooting' started by Dayna, Dec 26, 2018.

  1. Dayna

    Dayna New Member

    Dec 26, 2018
    Canon EOS 650D, 18-135mm
    I've bought (got for Christmas!) A Pentax 50mm 1.4f lens, but when I connect it to the body, it immediately comes up on the screen 'firmware update failed. Try updating again' 'memory card containing firmware is required to update'
    I put my card in my laptop and downloaded the latest update, 1.0.5 and it successfully updated BUT it still says it when I contact the lens!
    Won't let me do anything when it's on but as soon as my canon 18-135mm is back on the body it works perfectly...

    Any ideas or advice? Very new to this!

  2. Ray-UK

    Ray-UK Member Site Supporter

    Apr 25, 2017
    Rochester, UK
    Canon 50D, Canon 7D Mk II, Canon 10-22, Canon 24-105 L Mk 1, Canon 24mm 2.8, Canon 50mm 1.8 Mk1, Canon 70-210, Canon 100mm usm macro, 3x Metz 58 AF1 & too many film cameras, mainly Pentax
    I'm surprised that nobody has answered this sooner.
    You cannot use a Pentax F lens on a canon camera, it just isn't compatible. You need a Canon lens or at least on that is made to work with Canon EOS cameras.
    The reason you get the firmware error message is that the pentax lens is shorting out the little gold contacts in the camera body.

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