[ATM] Cooling Fans and Image quality

["Russell Jocoy" <russjocoy@hotmail.com>]

  To all on the list,

        My new 9"x 5/8" primary mirror, (made of soda lime glass), is very 
happy on a six point cell.
            I installed a 12volt vibration free (computer fan) to blow 
"across" the primary mirror's
              surface for cooling and for keeping dew at bay... It is very 
sucessful at keeping the
               moisture off the mirror's face, but in high humidity 
conditions it will lag after about
                4 hours..
            To say that this cooling, changes images seen through the 
eyepiece, maybe...
                   What I mean to say is that the temp. change was not more 
than 5 degrees, and
                      I myself saw no difference when the fan was on or off. 
Although this may
                        change dramatically in colder temps. , in small 
changes in temp I saw no difference.
                    Plate glass mirrors produce fantastic images... and if 
they are supported correctly,
                         can impress even the professional (if you call 
yourself that)
                                                              Russ Jocoy
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


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