Quote:
Originally Posted by jjjnettie
Any scope that has a mirror eg. newtonians and RC's, will experience light erosion. The photons, when they hit the mirror, dislodge the aluminium atoms. So eventually the mirror will need recoating.
Some people of course believe that it's due to environmental factors like exposure to weather eg dew, dust, the occasional frog dropping and just plain old age.
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Thanks JJ for the above
Chris, other things that contribute are continuous cleaning, extreme changes of temperature, and the quality of the original coating and the amount of time spent out under the stars.
I have had this scope about Ten years , so if I look after it is should see me close to the end of my Observing life
Cheers