In this instructable, you'll see how to make a flash modifier to focus the light into a narrow beam to add emphasis to your photo
Step 1: Cut the Soda Straws
Visit your local "Party Supply Store" and ask for black straws. Two packs of 50 costs about 3 Dollars US. Also visit a local hardware store and pick up a section of vinyl drain pipe. (Hint: these are sold in 10-foot lengths, so look for elbows or have these cut in the store so they'll fit in your car)
Mosey on home, after paying for your purchases of course, and cut the straws in equal lengths. Load these into the drain pipe section for a tight fit.
Step 2: Load Them Tightly Into the Drain Pipe
Once you get most of these straw segments jammed into to drain pipe it should look something like this.
Use a bit of spray adhesive to hold them in place.
Step 3: Attach It to Your Flash
Now attach it to your flash. I used a bit of black foam to help hold it in place.
Step 4: Ready-Aim-Fire!
The finished result can focus the beam into a fairly small spot. Keep in mind that longer straws make a tighter beam. Its all about the aspect ratio.