Hi all skydiving friends! I'm flying paraglider and I'm thinking about buying newton sight for taking photos with the digital camera fastened on my helmet. Please can anybody describe me, how the Newton sight is realy working? When I move my head in helmet, the cross insight the sight is changing its position correspondingly, or it "dissolves" and I have to find it again by finding the right position of my head (eye) relatively to the sight? Or it has any other behaviour? Does anybody know the geometry and properties of the glases in the sight (the physical principle of the sight)? Thanks a lot in advance. Jakub Serych
