Reversal Rings --- Minolta AF

Discussion in 'Minolta' started by Alan Browne, May 16, 2004.

  1. Alan Browne

    Alan Browne Guest

    Alan Browne, May 16, 2004
    #1
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  2. Alan Browne

    lalil Guest

    How do you control the aperture of the Maxxum lens in this situation?
     
    lalil, May 16, 2004
    #2
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  3. You don't control the aperture. I know there is a cannon reversing device
    that has a mechanism to control your lens aperture. So as far at the
    camera is concerned, the camera thinks that the lens is mounted the right
    way. Not sure about autofocus. However this device costs some $400 or so.

    I doubt that what Adorama is offering is more than a machined piece of
    stainless steel.

    Alan, you are right, the lens even looks more likely to be a Yachica lens
    or a Contax. Adorama must have messed up the links.

    Elie
     
    Elie A Shammas, May 16, 2004
    #3
  4. Alan Browne

    Alan Browne Guest

    I have no idea, which is part of why I'm asking the question.

    One could hold the little aperture tab over while watching the meter,
    but it would be tedious going, not to mention the risk of jerking the
    rig during exposure...

    I could take a lens back cap, cut out the middle and use the resulting
    ring to hold the aperture in position... (Maxxum AF lenses apertures are
    held closed by a spring when off-body ... the back cap holds it open (I
    presume) to keep the spring tension constant.)

    Cheers,
    Alan
     
    Alan Browne, May 16, 2004
    #4

  5. Since all it needs to fit the ring is a 49mm filter diameter, you can use
    any lens of that size, you don't need a Minolta mount.
     
    Philippe Boite, May 16, 2004
    #5
  6. Alan Browne

    JD Guest

    I am an old olympus guy so the answer is from that perspective.
    If you can obtain a MANUAL extension tube you can use that on a reversed
    lens. You focus with the lens wide open then stop down for the needed
    exposure value. A side benefit of having that manual tube on there is a
    small amount of protection of the rear element of the lens.

    As another person pointed out, you are not limited to using any given brand
    of lens, you are hanging off the filter ring so you just need to match that.
    No auto focus, no aperture control.

    JD
     
    JD, May 16, 2004
    #6
  7. Alan Browne

    lalil Guest

    "Maxxum guys" (or rather lenses) do not have the luxury of an aperture
    ring.
     
    lalil, May 17, 2004
    #7
  8. Alan Browne

    lalil Guest

    What you write sounds possible, but I'm not sure how you get (AND
    maintain) the required aperture during exposure. I don't suppose
    you'll be shooting wide open in high magnification resulting from the
    reversed lens.
     
    lalil, May 17, 2004
    #8
  9. Alan Browne

    Alan Browne Guest

    Sorry for the late reply... your post appeared on my server just now...

    One way is to shoot wide open and verify what the in-camera meter
    believes the wide open aperture to be.

    For smaller apertures, using the ring I describe above to hold it
    partially closed, I also have to find a way to determine how many stops
    down from the meter it is... not easy.

    Mystery continues.

    Cheers,
    Alan.
     
    Alan Browne, May 19, 2004
    #9
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