Several months ago I posted an Instructable about making a simple sun filter with a black marker and a sheet protector. That approach, although it did block out most of the light, didn't work very well and threw everything out of focus. This one, using a floppy disk and some card stock, works much better and doesn't take anywhere near as long to make. There's also slightly less of a pink color, though part of the blue component of the color seems to be from UV that makes it through the filter. The effect seems to go away when used with a telescope for some reason. Instead, the disk filters the light to a more realistic orange.