You call that a long lens? _THIS_ is a long lens.

Discussion in 'Digital Cameras' started by J. Clarke, Jan 9, 2014.

  1. J. Clarke

    J. Clarke Guest


    In photographer's terms, they are using a galaxy cluster 3.5 billion
    light years away as a lens to image other galaxies 12 billion light
    years away. Think about it--that's a 33112556654032800000000000000 mm
    lens. Have no idea what the aperture is--it would be measured in
    thousandes of light years, but the f ratio would still be pretty small.
    J. Clarke, Jan 9, 2014
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  2. J. Clarke

    RichA Guest

    The article is LOADED with errors. 3.5 billion? How about 13.5B, the actual number.
    RichA, Jan 9, 2014
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  3. J. Clarke

    Sandman Guest

    Oh, and here's the long list:
    Uh, one item? And it's even wrong. 3.5B is the distance to the Abell 2744
    cluster, and the news is the background galaxies that are *12* billion
    light years away (not 13.5).

    And it's all there, right in the article.

    Abell 2744:

    "Distance: 3,982 Mly" - Which is the distance to its center.

    They used the gravity of Abell 2744 to focus light from galaxies more than
    12 billion light years away. Here is the news from Nasa:
    Sandman, Jan 9, 2014
  4. J. Clarke

    Whisky-dave Guest

    I don;t think that's corect it is 3.5 Billion not 13.5.

    The cluster they are talking about at 3.5 billion ly is used to magnify objects that are more than 12 billion ly away. 13.5 bilion is almost the know edge of our universe.
    Whisky-dave, Jan 9, 2014
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