measuring focal length

For a full discussion on measuring focal length and aperture in homemade lenses, see this

Dustyn Lyon faved this
  • reathel geary 5y

    ty, keep this up and I see a book in the future.
  • Falling Thru The Lens 5y

    This is very informative! I agree, the beginnings of a book.
  • Rolf Müller 5y

    Thank you for this information! It was no more present how to get the focal length exactly... my study in physics is very long time ago!
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Taken on May 10, 2010
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