Review on US Forge 104 Shaded Welding by Ernest Duckett

I used it to photograph a rare transit of Venus in 2012. It worked pretty well. But one thing I noticed: There were slightly blurred spots on the glass. They didn't appear to be stains because no matter how much I rubbed the spot with a glass cleaning cloth, the stain still stayed. But all I did was move the position of my camera's glass away from the blur, so it worked in the end!