SONY A100 / MINOLTA LENS CONVERSION

Discussion in 'Sony' started by DANIEL MURRAY, Aug 8, 2006.

  1. I just purchased a Sony A100 and would like to know how my Minolta lenses
    convert to the digital camera.

    I have the following autofocus lenses:

    MINOLTA 50MM 1.7
    MINOLTA 75-300 1.45-5.6
    MINOLTA 35-105 3.5-4.5
    TAMRON 28-200
    SIGMA AF SUPER WIDE II 24MM 2.8

    Is there a standard formula for converting these?

    Thank you,

    djm
     
    DANIEL MURRAY, Aug 8, 2006
    #1
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  2. DANIEL MURRAY

    ian Guest

    If they are minolta autofocus fit then they will fit.
     
    ian, Aug 8, 2006
    #2
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  3. They will all fit the A100, and the first three will give surprisingly
    good performance for their age. The Sigma had an excellent reputation
    and may well live up to it, too. The Tamron 28-200 is unlikely to be
    wonderful.

    In terms of coverage, you will cropping the 24 x 36mm frame down to just
    under 16 x 24mm, which means losing over half the image area, and a
    third of the linear dimensions. That's similar to using a lens 1.5X as
    long on the full frame, so the A100 is said to have a '1.5X crop factor'
    or a '1.5X sensor'.

    So, think of your 50mm as being like a 75mm, your 75-300mm as being like
    a 112 to 450mm, your 24mm as being like a 36mm. Just don't say 'my 50mm
    becomes a 75mm' or you will get the Real Focal Length police arresting
    you for trying to clarify your understanding without regard to
    mathematics, optics or syntax. This really gets 'em annoyed.

    But, if you want to mutter to yourself, 'let's see, my 35-105mm will be
    a 50 to 160mm', and keep this deviation private, you'll find it actually
    works that way and you stop being confused.

    David
     
    David Kilpatrick, Aug 8, 2006
    #3
  4. DANIEL MURRAY

    Alan Browne Guest

    The Minolta's (if they are AF (eg: Maxxum, Dynax)) will work.

    The Tamron and Sigma should work, but no guarantee.

    There is no conversion to be done.

    Or perhaps you meant optical differences? The sensor is 2/3 the size of
    the 35mm film frame (eg: 24x16 mm in lieu of 36x24) so the image will be
    "smaller" on the sensor. IOW it's as if the focal length were 1.5x
    greater. Not a bad deal except for wide angle.

    Cheers,
    Alan
     
    Alan Browne, Aug 10, 2006
    #4
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