Rear Projection Solar Telescope

Dark regions on the solar surface appear in generally predictable patterns and locations, growing larger over a few days to a few months and then fading away. Sunspots develop where high concentrations of magnetic field inhibit the flow of energy, producing cooler regions compared to surrounding areas.  

This is a useful scope for schools & colleges for Astronomy presentations. Projection method is safe & effective way to enjoy sun's features.

In this project i have used 60mm achromatic doublet lens with 25 mm metal eyepiece. Scope has a 3 inch by 3 inch secondary mirror. Casing is made of 25 & 12mm rubber wood. Lens is housed in a 70mm Aluminum tube. Here the image of the sun is projected on a white plastic sheet.

Ready for machining

  

Machined focuser & collar