Dear Marc, your possibilities to start at the beginning of May with high resolved observations sounds really good. I would be really happy, if you could contribute with such a kind of spectra. The more spectra we collect, the more precisely would be the estimation, of the time differences of the V and R eclipse. Probably I will be able to take my first spectra at the earliest in the middle of May. I designed an animation for an object related seminar in May at the University of the city of Wuppertal, in order to demonstrate in priciple the process of the eclipse. But unfortunately is not allowed to upload ppt files here. If you are interested, I could send it via email.
Ernst