Old lens + 300d - what happens?

Discussion in 'Digital Photography' started by Gareth Tuckwell, Aug 12, 2004.

  1. I have an old (3 yrs) sigma lens attached to my film eos 300 and am
    considering a 300d. I know the lens will probably need re-chipping before it
    will 'work' on the newer digital bodies, but what exactly will be the
    problem - in what way will it not 'work' without re-chipping?? Is it just
    the autofocus that will fail, because surely the camera would be able to
    'see' through the lens and still take a photo, or might the camera be unable
    to measure the light properly?? Or will the camera just refuse to take
    anything?

    I know - take the lens to a shop and try it, only I don't live near any
    camera shops, so this will have to wait a while!
     
    Gareth Tuckwell, Aug 12, 2004
    #1
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  2. Based on my experience (8-10 yr old 14mm Sigma on 10D) it will only work
    at full aperture - it just won't stop down at all. It will IIRC take a
    picture if set at full aperture. If you try setting at any other
    aperture you may get an error message.

    David
     
    David Littlewood, Aug 12, 2004
    #2
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  3. Gareth Tuckwell

    Tony Spadaro Guest

    One of mine gave an error code, locking up the camera, and the other simply
    worked but the diaphragm never closed down. One had been re-chipped once but
    I don't know what the problem was as I didn't own it at that time. Both
    lenses were deemed "too old" by Sigma to be re-chipped. The one I bought new
    was 6. The one that had been re-chipped had come back from Sigma only one
    year earlier after its re-chipping, which took 6 months - during which the
    owner replaced it with a better lens and I picked up on what turned out to
    be a very bad trade.

    --
    http://www.chapelhillnoir.com
    home of The Camera-ist's Manifesto
    The Improved Links Pages are at
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    A sample chapter from my novel "Haight-Ashbury" is at
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    Tony Spadaro, Aug 12, 2004
    #3
  4. Gareth Tuckwell

    Boris Harss Guest

    Hi!
    A 3-year old Sigma will likely be fine without re-chiping. The problem
    allready occured with some of the later Canon film bodies.
    I get an "Error 99"

    Unfortunately the latter - at lease in my case with an 14mm/3.5 Sigma
    The loss would likely be small compraed to the price of the Camera...
    ;-)). I'd just try and assume for now that all will work.

    Cheers,
    B.
     
    Boris Harss, Aug 12, 2004
    #4
  5. Gareth Tuckwell

    E. Magnuson Guest

    You will get an "Err 99" indication and you will not be able
    to take a photo. Turning off AF will not make any difference.
     
    E. Magnuson, Aug 12, 2004
    #5
  6. I know it won't work as I contacted Sigma, they didn't say why it would not
    work, only that lenses of my type (28-300 Aspherical Hyperzoom) with a
    serial number earlier than 3001001, would cost 35GBP to re-chip the lens.
    This would be only £5 with proof of purchase, but I don't have that!

    Thanks for the advice everyone though.
     
    Gareth Tuckwell, Aug 12, 2004
    #6
  7. Gareth Tuckwell

    Tony Spadaro Guest

    Wrong. The problem is with Sigma. They reverse engineer the mount
    consequently Sigam lenses are never actually compatible with Canon bodies.
    Sigma has no idea what is really in the Canon chip. Just one more way for
    Sigma to screw the public in order to save a buck.

    --
    http://www.chapelhillnoir.com
    home of The Camera-ist's Manifesto
    The Improved Links Pages are at
    http://www.chapelhillnoir.com/links/mlinks00.html
    A sample chapter from my novel "Haight-Ashbury" is at
    http://www.chapelhillnoir.com/writ/hait/hatitl.html
     
    Tony Spadaro, Aug 12, 2004
    #7
  8. Gareth Tuckwell

    eawckyegcy Guest

    http://heasarc.gsfc.nasa.gov/docs/snr.html

    Intelligence reports from Pakistan are showing that Al Queda has
    discovered that if you attach an old Sigma lens to a new Canon body
    that similar physics ensues. Secret documents filed in the lowest
    catacombs at Site R -- Cheney eyes only -- written by specialists at
    the United States Otdel Obespechennosti Rodina contain images of Osama
    himself tickling the dragon's tail by actually mounting an old Sigma
    lens to a Canon digital body! It is known that core collapse and
    subsequent detonation only occur posterior to AF activation. Now you
    know why photographers are being hassled for taking pictures of
    Federal Property.

    I would tell you more, except that there is someone knocking at my
    door. I don't know who ))(!)! [email protected](

    X-Exception: posting.google.com; connection reset by peer
     
    eawckyegcy, Aug 13, 2004
    #8
  9. Gareth Tuckwell

    JPS Guest

    In message <3XRSc.252302$>,
    The number of secrets can't be infinite, though. Someday they will
    figure it all out, if they haven't already.
    --
     
    JPS, Aug 13, 2004
    #9
  10. Gareth Tuckwell

    jean Guest

    Sometimes it is not easy to spot what is wrong. With the Sigma lens I owed
    (brand new BTW), I noticed the exposure was different when I compared it to
    the "kit" lens on my Drebel set to the same settings and taking the same
    scene. It took me more than the usual two weeks to find out so it was
    impossible to return. I found the diaphragm would not close to the same
    position all the time and it would behave differently on different cameras.
    Sad to say nowadays it is almost impossible to buy "foreign" lenses and
    expect the same performace as the ones from the maker of the camera.

    Jean
     
    jean, Aug 13, 2004
    #10
  11. Sounds interesting, definitely worth the money. I think I'll try this one...
     
    Gareth Tuckwell, Aug 13, 2004
    #11
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