A new Err 99 problem

Discussion in 'Canon EOS' started by robert_debarba, Mar 29, 2004.

  1. I have done quite a bit of searching for anyone who has encountered
    my particular Err 99 problem but have yet to find another.

    When I use my 300D with Canon EF 100mm f/2.8 Macro USM, everything
    works fine. When I attach an EF25 II Extension Tube (brand new), I
    get Err 99 about 50% of the time when I press the shutter button. I
    almost always use this in manual focus...can't really be sure if it's
    happened in auto focus. Has anyone else run into this? I'm trying to
    determine whether I should be returning the extension tube - I also
    have a message into Canon's tech support on this. I've tried the
    extension tube with a Tamron 75-300 and it worked fine but I haven't
    used it many times like that.

    Also, I see a number of people getting Err 99 with the 18-55 EF-S
    lens that comes with the 300D. I also had that problem but the error
    code came up as soon as I turned on the camera (after the lens made a
    short, horrific grinding noise). I returned the lens to the NJ repair
    facility...came back about 10 days later and haven't had that problem

    Any help is appreciated.

  2. hi bob,

    i have had error 99 problems with my 300d and extension tubes. the problem seems to spring from a lack of decent contact between the electrical connections, -some lenses have slighty more raised contacts and therefore ensure enough current to flow, while others [like my efs 18-55] have slighty lower contacts, and i get an error.

    there's probably nothing wrong with your extension tubes. i added a bit of solder to the tips of the contacts in my tubes, and now they work fine...

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