Astrozap Flexible Dew Shields
Astrozap flexible dew shields are the ultimate flexible dew shield made of lightweight durable ABS plastic with a felt lined interior. They will not sag if they become damp. These shields will delay the formation of dew for several hours under average conditions, meaning without severe dew. They work by retaining some heat from your telescope in a column of still air in front of the optics, delaying condensation and the arrival of new moisture. This is a passive approach to dew management. Using a telescope in very damp conditions will require a more aggressive solution where heat is applied to keep the optics above the dew point. If the outside of your optical tube gets dripping wet, you will need a more aggressive actively heated solution.