Olympus lens on Canon EOS - PixelPix Photography Help Blog

Discussion in 'Olympus' started by PixelPix, Jun 23, 2007.

  1. PixelPix

    PixelPix Guest

    PixelPix, Jun 23, 2007
    #1
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  2. I think you have your critique of your early adapter the wrong way
    round: if you couldn't focus at infinity it is because the adapter was
    too thick, not too thin. Closer focussing moves the lens away from the
    sensor.

    There are a couple of other reasons for needing a quality adapter, one
    with the correct thickness which, although they don't apply to the
    lenses you list, could be important to anyone else following your blog.

    If you are using a zoom lens then the wrong adapter thickness, whether
    too thick or too thin, will result in the focus drifting with zoom. So
    you might get excellent manual focus at the long end of the zoom and
    find the focus shifting when you pull back to the wide end of the zoom.
    All of my OM lenses have separate zoom and focus rings and hold their
    focus excellently throughout the range. This seems to be typical of
    older MF lenses, while AF lenses which can rely on the electronics
    correcting any mis-focus as soon as the shutter is pressed, and it is a
    shame to lose that reliability because of a cheap adapter.

    Also, lenses which use internal focussing mechanisms (rather than
    shifting the entire optical assembly back and forth) rely on the correct
    backworking distance for optimum performance. A poor adapter can result
    in sub-optimal lens performance, with resolution much lower than it
    should be.
     
    Kennedy McEwen, Jun 23, 2007
    #2
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  3. PixelPix

    PixelPix Guest

    Thanks Kennedy,

    I have made the change and also quoted your zoom and internal focus
    comments (giving you full credit naturally)... let me know if this is
    not OK and I will remove it.

    Cheers

    Russell
     
    PixelPix, Jun 23, 2007
    #3
  4. Thanks Russell, your welcome.
     
    Kennedy McEwen, Jun 23, 2007
    #4
  5. PixelPix

    Wayne Guest

    Wayne, Jun 24, 2007
    #5
  6. PixelPix

    PixelPix Guest

    [CHOMP]

    I am happy for you to link to any part of, or all of my blog
    Wayne. ;-)

    Sorry I don't have a "links" page on the blog yet, but I will get to
    it soon and return the link.

    Cheers

    Russell
    My Photography Help Blog: http://blog.pixelpix.com.au
     
    PixelPix, Jun 24, 2007
    #6
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