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Origin of standard focal lengths

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  • Origin of standard focal lengths

    Something I've been wondering. There is a fair bit of standardisation of focal lengths and I wondered where it all started. We have 24mm, 28mm, 35mm, 50mm, 85mm, 135mm. Then there's the zooms, 24-70 and 70-200 being very common. I realise there are many exceptions but I just wondered if there was any particular reason why we've generally stuck to some of the common ones. Why always 28mm and never 27mm or 29mm for example?

  • #2
    Hi Jamie and welcome to GDF.

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    • #3
      I think it has to do with the lens glass.
      https://en.wikipedia.org/wiki/Histor...ic_lens_design
      Sketching not only helps you work out good ideas, it helps you get past the bad ones.

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