The dew shield was the first idea that came to my mind. It was logic, simple and most probably efficient. After different search on Internet I decided to build my own since there is no need to get specific knowledge and material. After finding a smooth light material that can support humidity (of course) I took several measures on my scope and rapidly designed and built it.

After several observing sessions I dare say I was quite disappointed. Indeed, this kind of solution did better protect my corrector plate but that depends on the duration and the orientation of the telescope the dew always comes. In my opinion there are several problems with this part. First of all, due to the weight of the dew heater you must balance your telescope to avoid damaging the motor drives and to save your accurate tracking. Secondly, during an observing session it's necessary to put and remove the dew heater many times to set a Hartman mask on the front of the telescope so as to focus it. This manipulation can rapidly become tricky in so far as you can lose your alignment in case the OTA should move during the operation. Moreover, the control software could lose its north as well. As mentioned before, according to me the main problem for this part is that it's totally unefficient if your telescope works around the zenith. This remains a huge problem because the better way to do visual and CCD sessions is to observe deep sky object near the zenith. At that time I understood that the best way to resolve my problems would be the electronic.