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    Re: 35mm Super Takumar Lens for CN on DSLR
    From: Norm Goldblatt
    Date: 2015 Aug 11, 15:43 -0700

    Frank and Greg- Here's the photo I used to try to calibrate my iPhone 5s. This is all very interesting. The data I took using this photo showed a wide range of calibration constants. I could have made mistakes and I'll check it again.  I did find a reference to field distortion for the 5s and it looks great  I also include this. Oh, the  date taken- 7/6/2015 10:34 PM. My method is different from Greg's.  I calculated the angular distance between all pairs of stars and compared it to the photographic position using ImageJ.  

    Off this topic, I've processed my sextant measurements of Venus-Jupiter angular distance over the month of July and I'm quite pleased.  Will 'publish' them later for anyone interested.  

    So glad I met all you folks. 

    Norm

     



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