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Hi everyone,
interesting disscussion. I use Ice packs held around the rear of the OTA of my 14" SCT with ocy straps. Tried a peltier but it needed a lot more than 1 for this sized scope. Five ice packs brings the OTA down to below ambient in 2 hours. I don't get the freezing conditions that some of you chaps get. Usually only gets down to 5 degrees minimum.
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