Convenient and helpful device to improve focus of camera tube on Sol’Ex spectrohelioscope
3D-printed Bahnitov mask designed for 30mm guide scopes – purchased from ebay for £6.
astronomy.me.uk The Website of Lichfield Radio Astronomy Observatory (LRO).
Andrew Thornett, Lichfield, England, M6THO, andrew (at) thornett (dot) net
astronomy.me.uk The Website of Lichfield Radio Astronomy Observatory (LRO).
Andrew Thornett, Lichfield, England, M6THO, andrew (at) thornett (dot) net