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Are you using a dew shield or just a dew heater . I seen on you tube (can't remember the site now) where a guy done a test with a dew shield only and a dew shield plus heater strip and just a heater strip. The best result was just a dew shield to stop the dew forming . He also used a heat measuring gun which showed the outside of the front glass was about 3 degrees hotter than centre. I have just purchased a mak 180 just for planetary images, (yet to ve used) and decided to just go with a dew shield .
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