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What model is it?
Roland Christen has commented before about being careful about thermal shock and fluorite elements. But I think he is talking about a large temperature shift. It can break the lens.
Use a dew heater and avoid the risk. One of the reasons I wanted a dew heater on my RHA scope is I don't want dew staining on the inside elements that would be hard to clean. So for no other reason that's a good reason to prevent dew.
Also you could leave the scope outside when you want to use it so it cools off without going from warm inside to cold outside.
Also I used to use this wrap around insulation blanket with a Velcro strip to prevent dew on refractors. It worked really well. You wrap it around the outside of the scope where the objective is and it keeps it a bit warmer than the surrounding air and no dew. Its like that car windscreen insulation material.
Greg.
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