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  1. Aperture Size Chart

    Adwww.nationalaperture.com/
    Standard and Custom Sizes from 0.5um to 1000um
  2. Iris Diaphragms

    Adwww.newport.com/Iris-Diaphragms
    Continuously Variable Optical Aperture Size with Iris Diaphragms
  3. F/stops Define Lens?

    Adexplora.bhphotovideo.com/Learn
    News, Reviews, Tips, Guides, Blog. Learn Lens Aperture F Number