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Is ISO ISO?

Discussion in 'Open Discussion' started by jvenard, Oct 7, 2013.

  1. jvenard

    jvenard New to TalkEmount

    3
    Sep 23, 2013
    Ok even though I started taking photos in the days of ASA, I understand what ISO means, however, is ISO across the various Mfg's?

    I have been shooting nikon since I was a kid in the 70's.

    Recently after reading the stuck in customs web site I bought an NX7 but still love my D800

    But after shooting it crossed my mind how each mfg deals with the issues of standards?
     
  2. Poki

    Poki TalkEmount Hall of Famer

    Aug 30, 2011
    Austria
    No, ISO is NOT ISO. In some cameras, ISO 100 (according to the camera) is a measured ISO 80, in others it's 160. There are two main reason why manufacturers do this:

    1. To have less noise in comparisons with other cameras
    2. To compensate for some kind of light loss (for example for Sony SLTs)

    Also, there are slight variances that are totally random, but they are small enough not to hurt anybody. It feels like all the Android phones cheating in benchmarks, but that seems to be the industry nowadays.
     
  3. Bill

    Bill TalkEmount Veteran

    339
    Oct 22, 2012
    Brisbane, Australia
    Bill
    • Like Like x 2
  4. Bugleone

    Bugleone TalkEmount Veteran

    210
    Aug 21, 2011
    Even in the era of A.S.A. there were differences between film manunfacturers. The archtype event of playing about with ASA was back in the early 60's when Ilford changed the film speed of 'HP3' from 200ASA to 400ASA...the film in the boxes was actually the same stuff!