This winter I saw for the first time images of this well known open cluster together with a cloud of glowing Hα-gas.It is supposedly a planetary nebula apparently including much of the cluster.
This image turned out not very good. I started with a bunch of 10-second-frames for the stars, but without dark-frames. As a replacement I imaged the stars with 60-second-frames and a lot of longer Hα-frames.
Because of the extremely high humidity in this spanish winter the mirrors of the Elephant dewed over quickly. During installation of the telescope at the end of August at 40°C I dialed the heating strips in at the lowest level. This apparently was not enough now.
I had to throw away many hours of Hα-frames with a too low signal to noise ratio.
So it became clear that ventilation and heating of the mirrors had to become adjustable remotely.
So in the middle of March I sent a Pegasus Power Box to e-EyE and José Fernando installed it in place of the old manually adjustable controller.