Re: Help finding a converging lens with focal length of several feet

Make sure you
know the amount of optical power as they may only think in diopters of
power which of course are inverse focal lengths expressed in meters.

TRIVIA QUIZ

In what context is (or was) "diopters per watt" a
meaningful figure of merit?
.

Relevant Pages

  • Re: Help finding a converging lens with focal length of several feet
    ... know the amount of optical power as they may only think in diopters of ... power which of course are inverse focal lengths expressed in meters. ... In what context is "diopters per watt" a meaningful figure of merit? ...
    (sci.optics)
  • Re: Got any eyeglass experts here?
    ... way) the focal length is related to diopters as the inverse in meters - ... Since 0.75 meter is roughly 29.5 inches, it sounds like you should start ... with 1.5 diopter glasses. ...
    (rec.crafts.metalworking)