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Telescope thermal sensitivity (for focusing)
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04-04-2021, 09:04 PM
The_bluester
(Paul)
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Join Date: Feb 2011
Location: Kilmore, Australia
Posts: 3,342
Many refractors are relatively stable. The focus point on my SVX80T moves, but not a large amount. The SCT on the other hand changes focus lots, and quickly. On a cool night after a hot day it can go from pinpoints to doughnuts in 20 minutes.
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