|
Humidity and temp are the key ingredients. When the ambient temperature drops the surrounding air can't hold the same amount of moisture and it condenses as dew.
Keeping the scope slightly above ambient will reduce and delay the amount of dew, hence the dew heaters etc. I'd assume your balcony is holding some heat around the scope whereas outside the ambient is probably lower. The grass/ pavers can assist.... the pavers will hold some heat during the day and give a a slightly higher temperature for a little while ( down side can be adverse temperature seeing effects!!??)
Dew also falls vertically to earth, hence the marginal improvement using dew shields; extends the front of the tube so the front lens gets more protection and can "contain" a warmer blanket infront of the lens.
|