simple lenses

Discussion in 'Large Format' started by ross_shepherd, Feb 26, 2006.

  1. Has anybody tried using simple lenses like loupes or diopters or
    reading glasses etc. as lenses also if I were to do so how would I
    calculate aperture?
     
  2. Ross,

    Sure, it's a lot of fun.

    As for calculating f-stops,

    http://www.apug.org/forums/showthread.php?t=25071

    Also, verify with a Polaroid before doing any "critical" work.

    Steve
     
  3. How would I calculate the focal length of the lens?
     
  4. Don't calculate, measure.
     
  5. How do I measure?
     
  6. Use it as a burning glass. Focus it on the sun, measure lens to hot spot distance.
     

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