[ArrogantBustard]

Hydrogen-Alpha filter, or projection?

[colinhester]

Hydrogen-Alpha filter, or projection?
Neither. This was back in the gool ol' days when small refractors came with screw-in filters for the eyepiece, which gave the sun a greenish tint. Later I learned this method was a very bad idea. These types of direct-view filters were prone to cracking, exposing the eye directly magnified sunlight.