Images of the Sun, our local star, at a range of wavelengths with specialist solar telescopes. Imaging tutorials, solar bits and pieces for sale, talks and outreach with the Charlie Bates Solar Astronomy Project CBSAP.
I'm always impressed how large sunspots appear to be at Calcium wavelengths as can be seen in this image taken with the 40mm OTA at 650mm focal length with the PGR Blackfly IMX249 camera and homebrew CaK filter.