Dew Humidity Problems with Telescopes

[starwind]

I was hoping some one could help me to fix the problem I had last night.I went from 3000ft to 9000 ft and ended up with moisture inside the lens on my Celestron 5i. First any reccomendations to fix if It happens again while im on the mountain? Second should I put desicant in front of the star diagonal to minimize. I Live in Hawaii so 75-80 % humidity is normal. Thanks and aloha

[philip d]

Are dew heaters available that might be the solution, course extended shield for the front objective reduces the build-up, we get 80 plus humidity during the summer here,

Once was so foggy in the valley unable to see anything, returned home and sky opening intown, continued on Mars view under a tree, protection let me view for over 1/2 hour, ...also use more than one instrument, so keep one in the vehicle, and change when things build up, extends the observing time...

[starwind]

Thanks a lot philip