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Charles
I wrapped it around the draw tube near the camera. Its the contraction with the cold that throws the focus out. Keeping it warm reduces this - its doesn't stop it entirely but it makes it much more manageable. Last night I needed to refocus after about 90 minutes as the temperature dropped significantly over this period. Normally I would need to do it every 30 minutes.
The FSQ106 has a very narrow focus range - without an electronic focuser it can be a real pain. When the new focuser arrives, I expect to keep the dew strap on
Pete
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