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Hi Jeelan . It refers to the need to allow your telescope to cool down to the ambient air temp. If the optics etc. are warmer than the air around them they will heat the air and create currents in your tube that will make your image soft or blurry/hazy and move about. Many owners with open tube telescopes use fans to help cool faster. Just stick your scope outside a bit earlier. Most times an hour to hour and half is enough. Cheers, Richard
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