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  1. #41

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    Thanks Ralph! I wrote the equations by hand and use the long horizontal line for divide so I didn't need the bracket. I forgot to put them in when translate the equation to computerized form.
    The 2 equations are solutions to the quadratic equation -d1^2 +d*d1 -f*d =0 and thus the top equation always yields the larger distance. When the magnification is <1 then d1 < d2, but using the 2 equations I posted the d1 is always the larger one.
    I derived the above quadratic equation by using the equation 1/d1 + 1/d2 =1/f and substitute d2=d-d1.

  2. #42

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    I think some of my posts as well as Ralph's are deleted from this thread.

  3. #43
    RalphLambrecht's Avatar
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    I think so too. It happened yesterday or the day before. Nevertheless, I think we had this one nailed anyway.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

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