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By the way I intend to control the whole optical systems temperature within about 0.2 C. This will mean focus will be constant no matter what the ambient temperature does. The Astrodon filters were very expensive but they essentially do not vary as far as optical path is concerned. Time will tell.
It is all about careful control, too much and you end up with oscillating systems. Too little and you do not know where you are!
When I am at a séance I always like to strike a happy medium!
Bert
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