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Thread: Pure Optics

  1. #1
    Master OptiBoarder sandeepgoodbole's Avatar
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    Pure Optics

    Focal Length is reciprocal of the Diopter. It means, Zero Diopter , Plano, has Focal Length of Infinity. Now, I am going to write the Diopter n Focallength in Meter values as 'D/F '. 0.25/4 , 0.5/2 , 0.75/1.33 , 1/1 , now, the focal length is being written in centimeter. 1.25/80, 1.5/66.6, 1.75/57.41, 2/50 ,2.5/40, 3/33.33, 4/25. 5/20, 6/16.66 7/14.285, 8/12.5, 9/11.11 , 10/10, 11/9.0909 12/8.33 . Kindly notice, for change in Diopter from 1 to 2, the Focal Length changed from 1 meter to 50 cms, (Change of 50 cms) . But, for change of 11 to 12, focal length changes merely by 0.75 cm ! Let us try to understand the meaning. When a 0.25 sph. Lens gives 6/6 vision, its changing the Focal Length by 4 meters. When a 12 diopter lens achieve 6/6,focal length changes by just 8.33 cms. The lens pricing should be based up on the Focal Length. More the focal length, more should be price. The Rxs should also be written in meters and not diopters..Good change for recession !
    Last edited by sandeepgoodbole; 08-25-2009 at 09:30 PM. Reason: Key pad tantrums.

  2. #2
    OptiBoardaholic
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    Why not just start charging by longest axis? Bigger lenses more pricier?
    Or should that be the other way around? Because we will cut more off the original lens and waste it, should we be charging a "waste recycling" rate?
    The less we cut off, the less we charge for your lenses!!!

    Geez.....just wait till Borysko inc. gets hold of this gem!!:cheers:
    It’s so simple to be wise. Just think of something stupid to say and then don’t say it.

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