I've got a book (The Bryce 5 Handbook by Shamms Mortimer, pgs 335-338) that shows something like this. It describes how to take a sphere, flatten it and place it over the front of the camera to act as a lens. I'd say the dimensions of the lens would be something like 2x1x2 proportions (flatter 'front' to 'back' than 'top' to 'bottom' and 'side' to 'side'). Apply a glass material and play with the transparency, specularity and refraction. The one that shows the closes to what you're probably wanting is transparency 100 and specularity 0. The caption says to 'alter the refraction index' but it doesn't say to what. The original settings mentioned have refraction of 22, but I don't know if you'd go up or down from them (but I'd guess up.) Hope this helps! Susan