Allan,
I amde my own off axis solar filter by purchasing a 3.5" baader solar filter piece from
http://www.dracoproductions.net/baad...r_material.htm it took a bout a week to arrive. It came with instructions and it works a treat.
Mike Salway has an article here
http://www.iceinspace.com.au/63-136-0-0-1-0.html which got me started.
