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.
Andrew Thornett, Lichfield, England, M6THO, andrew (at) thornett (dot) net
3D-printed Bahnitov mask designed for 30mm guide scopes – purchased from ebay for £6.