The "Solar Explorer" is a self-made instrument from 3D printing. The aim of which is to make solar observation accessible to many amateurs and at low cost. You can observe the Sun surface by using light of hydrogen red line, calcium ultraviolet lines, helium D3 line... Doppler measure are possible and you can detect magnetic field (Zeeman) or trace of the solar corona out of a solar eclipse (advanced functions). Basically Sol'Ex is a compact spectroheliograph (it weighs less than 500 grams!).
Sol'Ex has already been produced to a large number of people all over the world, a small sample:
You can use it with a simple photographic telephoto lens, a small 2-inch refractor or larger instruments ... Here the solar limbs observed by using a one- meter focal length refractor (5-inch AstroPhysics):
The construction and use are described on the website: http://www.astrosurf...ntation-en.html
I am pleased to announce that a new version of the improved specific optics kit is just available today, and can be ordered from Shelyak Instruments: http://www.astrosurf...ontacts-en.html
Sol'Ex can be transformed into a powerfullstellar spectrograph (Star'Ex), can be used to measure your filters transmission and many more. It is a simple, flexible and efficient instrument (0.30 A band pass at H-alpha, give high contrasted images of sun surface).
It is also an educational project and a great experience to live concerning a large community of amateurs astronomer!