den9
TPF Noob!
went out front of my house and did a 1 hour exposure of the stars. i put my lens in a ziplock bag and left it outside in the cold for a half hour, then i took the camera out of the bag and took the shot, came back and hour later to release the shutter and the lens was fogged up. how do i keep it from fogging on long exposures (40 degrees outside)