I love the effect star filters give. I looked around and found a home made one on Flickr but there weren't any instructions on how to make it, so I figured I would make an 'ible showing how I made it. Credit goes to Rey Nocum for the original idea, you can find his page here http://www.flickr.com/photos/reynocum/sets/1804553/
*Please note this will work on any camera/slr lens that you can attach a lens hood to.
Step 1: Materials
*Metal screen (the kind used in windows)
*Pringles can/empty tape roll
*Utility knife (not needed but its easier to cut the can with)
Step 2: Cut It, Fit It, Tape It
To give you a basis of comparison my lens is 58mm and the can was too wide, so the can can accommodate a lot of lenses. The original by Rey Nocum was made out of an empty tape roll and his lens is 85mm (googled the model number on his lens hood)
Once you know what material your using, cut a strip of the container about a half inch thick or so (if using an empty tape roll it might be narrow enough already).
See it it will slide into the lens hood, if it's too big, as it should be, then cut out a small section and try fitting it again. You could measure it and cut once, but guessing and checking is probably faster.
Once you have it at the right size seal the seam with a piece of tape.
Step 3: Screening Time
Trace the inside of the ring on the screen, then trim away the extra screen leaving some space around the traced circle (see images) so we can make flaps.
Once you have it trimmed cut notches into it so the screen doesn't wrinkle when it gets folded. Then, fold the flaps up (see final picture).
*Please note you will need two of these screen circles if you plan on making an 8 point star
Step 4: Almost There
*Please not if you use some hot glue it will hold much better (thought of it too late to use on mine so there are no pictures or instructions, but I'm sure you know how to hot glue something).
If you are making an 8 pointed star then you need to tape (or glue) down the other screen over the first. Also, remember the wires in the second screen have to cross the first screen's wires at a diagnal
ie if the first screen is going this way + than the second should go like this x (see the last 3 images)
Once you have the whole thing taped down (or glued), test fit it in the lens hood. If it fits then all you have left to do it put some tape on the outside just to give it a slightly more finished look and protect the hood from scratches.
Step 5: And That As They Say Is That...
I just took a 2 quick test pictures to see if they work. They do.. I would guess the haze is the glare from the direct sunlight on the filter (its meant to be used at night) in combination with having something covering the lens. I plan on taking some more test photos at night (might not right away so it might be a while before I put new examples up). Again thanks to Rey Nocum for the idea you can find his original filter at http://www.flickr.com/photos/reynocum/sets/1804553/