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Re: ATM Eyepiece focal-plane position measurement.

Here's some more data on Televue eyepieces:

 TeleVue Eyepiece data   (inches)

<html><pre>
                        Focus to flange    Focus to end of barrel(s)

     20mm Nagler Type II           0.20    -1.29
     13mm Nagler Type I            0.20    -0.83    -1.08
      9mm Nagler Type I            0.60    -0.40    -1.15
      7mm Nagler Type I            0.31    -0.79
    4.8mm Nagler Type I            0.31    -0.80

     32mm Wide Field               0.31    -1.07
     25mm Wide Field               0.23    -0.62
     19mm Wide Field               0.23    -0.62
     15mm Wide Field               0.18    -0.70

     2" Paracorr*                 -0.13    -0.98    -3.07

</pre></html>
    *measured with 35mm camera attached to t-thread


Andy Saulietis / DTG Alt-Az-Fp Drive Systems
12617 Harriet Ln
Santa Fe, TX 77510 USA
409-925-8854 Voice/Fax