James, Paul and Robin thank you for responding to my request. I must say that I am a little challenged by what I intend to start studying. In fact, the sun is not my goal. In addition to my study of the Earth’s Shadow, i.e. the Antitwilight sky, I would like to combine the observation of its spectrum. At least initially, for this I think a low resolution is sufficient. The spectrum I obtain is given by an instrument that is little more than a toy. However, it is necessary to be able to compare the pixel values of one channel (e.g. of a frequency on the Red) with those of another channel.
The fact is that I tried them all a bit: As a sample source, I tried a tungsten bulb. I obtained very uncertain results; the spectral energy distribution is too uncertain. There are QE curves of the nikon D70 and a canon on the web, which nobody owns yet, not even in the second-hand market.
Unfortunately, I do not own a telescope and therefore cannot take spectra of stars. Mind you, with the reconstruction of the city after the earthquake of 6 April 2009, floodlights are shooting light everywhere, so from my site the stars have all but disappeared. Robin, you have given me a lot of work to do, I will study your article thoroughly.
Includo un’immagine dello spettroscopio che uso e un diagramma dei PV di uno spettro costruito usando il soft matlab. The spectrum is bad, but for a broadband study it should be fine.
Again, many thanks to everyone.
British Astronomical Association
Supporting amateur astronomers since 1890
