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)
Astronomy observatory in Staffordshire, England.
astronomy.me.uk : The Website of Lichfield Radio Astronomy Observatory (LRO)
Astronomy observatory in Staffordshire, England.