So what can I photograph now without exercising my knee? I tidied my portion of the study and came across my father Polygraph Lens that I had saved because it looked interesting. It is a lens 11 inches (27cm) in diameter. It is flexible plastic being wide angle on one side and fish eye on the other side. I have no idea what side I was using because I had to hold the lens and my camera at the same time, but I rather liked this effect!
@sjoyce So did I!! But that is what it says on the packaging! I have just looked up Fresnel lens as well, and I would imagine it is very similar to that. You are a font of all knowledge!! Thanks for your comments!
