FD lens problem on 350D (Rebel XT) with adapter

Discussion in 'Technical Troubleshooting' started by Robert Shears, Jul 15, 2017.

  1. Robert Shears

    Robert Shears Member Site Supporter

    Joined:
    Apr 24, 2017
    Messages:
    34
    Equipment:
    Pentax K-5, K-r, K20D, K100D Super. Canon Rebel XT (350D) EOS 20D, Eos 100, 500, 600, T90
    Various OEM and 3rd party lenses in Pentax, Minolta and Canon.
    I acted upon the suggestion in the Forum to get an adapter to use my FD lenses on digital. I bought one and today tried it out on my Canon 350D.
    I checked on the net for the correct way to fit it but have not had much luck finding trouble shoots for my problem.
    Having fitted my FDn 50mm F1.4 with adapter on the camera, I took a few dozen shots, stopping every few shots to examine the images and wonder what my problem was.
    The lens stopped down, this confirmed when closing the adapter.
    I set the camera to AV.
    The camera reported I was using an 80mm lens (probably due to using my 28-80mm prior to the 50mm) and the last AV value (F8) I had used with an EOS lens.
    I took a few images and the results were all over exposed to some extent, sometimes very over exposed.
    I matched the AV value on the camera to the lens and tried again.
    I tried changing the ISO
    My suspicion is that the contacts on the adapter are confusing the camera, maybe I should remove them.
    Any help here would be appreciated, my one correctly exposed image indicates that the FD lenses might produce reasonable images with this adapter in some circumstances.
    Some images of the adapter and one good image, one bad (but not as overexposed as some!)
    IMG_9420.JPG IMG_9421.JPG IMG_9422.JPG IMG_9402.JPG IMG_9404-001.JPG
     

  2. Craig Sherriff

    Craig Sherriff Member Site Supporter

    Joined:
    Apr 25, 2017
    Messages:
    49
    Location:
    Tasmania, Australia
    Equipment:
    60d, 10d, 1dmark3, t70 lenses ranging from 28mm to 600 mm, Mamaya C3 and 3 lens sets, Pentax MG and various lenses
    I too have a adapter for the FD to EOS and use a large number of FD lenses on my digital canon cameras and have not had this issue but my adapter does not have the contacts, The FD lenses are getting a bit old, you might also be having an issue with the lens.
     
  3. Robert Shears

    Robert Shears Member Site Supporter

    Joined:
    Apr 24, 2017
    Messages:
    34
    Equipment:
    Pentax K-5, K-r, K20D, K100D Super. Canon Rebel XT (350D) EOS 20D, Eos 100, 500, 600, T90
    Various OEM and 3rd party lenses in Pentax, Minolta and Canon.
    The lens worked fine on the T90 last time out but I did try another lens with same result.
    On a Pentax there is an option in the menu to enable use of manual lenses and use the "green button" for metering. I can find no reference to this on Canon.
    I might try masking the contacts on the adapter before removing them.
     
  4. Craig Sherriff

    Craig Sherriff Member Site Supporter

    Joined:
    Apr 25, 2017
    Messages:
    49
    Location:
    Tasmania, Australia
    Equipment:
    60d, 10d, 1dmark3, t70 lenses ranging from 28mm to 600 mm, Mamaya C3 and 3 lens sets, Pentax MG and various lenses
    When I shoot I do so in M or AV, a silly question but are you shooting in either of these two modes as I don't think it works in any of the others
     
  5. Robert Shears

    Robert Shears Member Site Supporter

    Joined:
    Apr 24, 2017
    Messages:
    34
    Equipment:
    Pentax K-5, K-r, K20D, K100D Super. Canon Rebel XT (350D) EOS 20D, Eos 100, 500, 600, T90
    Various OEM and 3rd party lenses in Pentax, Minolta and Canon.
    Camera in AV mode. Logically it should meter when I have stopped the adapter down and provide the correct shutter speed.
    Sometime tomorrow I will put sellotape over the contacts on the adapter and try it again, perhaps they are confusing the camera.
     
  6. Craig Sherriff

    Craig Sherriff Member Site Supporter

    Joined:
    Apr 25, 2017
    Messages:
    49
    Location:
    Tasmania, Australia
    Equipment:
    60d, 10d, 1dmark3, t70 lenses ranging from 28mm to 600 mm, Mamaya C3 and 3 lens sets, Pentax MG and various lenses
    I have a MD to EOS, a M42 to EOS, a Tamron to EOS as well as the
    FD adapter. In each case the lenses are similar to the FD, manual focus and manual Aperture. I can adjust the ISO, Shutter Speed and read the light meter when using the camera with no problem. You maybe correct in putting electrical tape over the contacts as they seem to be causing your camera to give a false reading, none of my adapters have the contacts on them.
     
  7. Robert Shears

    Robert Shears Member Site Supporter

    Joined:
    Apr 24, 2017
    Messages:
    34
    Equipment:
    Pentax K-5, K-r, K20D, K100D Super. Canon Rebel XT (350D) EOS 20D, Eos 100, 500, 600, T90
    Various OEM and 3rd party lenses in Pentax, Minolta and Canon.
    I will tape up the contacts and go again. I see on the WWW that some early EOS digital cameras had overexposure problems when using manual lenses on adapters, overexposure increasing slightly as the aperture was stopped down. The posters suggested that the graduation increase was pretty linear and could be compensated for. At the moment mine are not easily compensated for.
     
  8. Robert Shears

    Robert Shears Member Site Supporter

    Joined:
    Apr 24, 2017
    Messages:
    34
    Equipment:
    Pentax K-5, K-r, K20D, K100D Super. Canon Rebel XT (350D) EOS 20D, Eos 100, 500, 600, T90
    Various OEM and 3rd party lenses in Pentax, Minolta and Canon.
    The camera works properly (well with a tiny bit of over exposure) now I have taped the contacts up. The exif no longer specifies it as an 80mm lens so all is in working order.
    Tried it on a 20D as well with the contacts taped and it needed 2 stops of compensation but it metered fairly consistently. Without tape it was all over (overexposed) the place still. Taping the contacts have done the trick!
    Thanks to Craig Sherriff who offered help.
     
    Last edited: Jul 18, 2017 at 5:16 AM

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