I have made a lot of flash diffusers in the past, using anything I could get my hands on, from old milk bottles to marscapone pots. They all do a great job, but they don't last 2 minutes when out in the field. I saw this old Apple Airport laying around at Nottingham Hackspace and it immediately hit me that it would make a great solid long lasting flash diffuser.
The results are great, heres how to make your own.
Step 1: Remove the Internals.
The white plastic around the ports is a separate piece, but is held in place with one of the screws. So easy to add back in later.
Step 2: Mark and Drill Corners
I then placed the front end of my flashgun onto the centre and drew the outline.
I then found a drill bit that roughly matched the corner radius I had drawn.
Carefully stack up some scraps of wood under the plastic and drill out the four corners.
Step 3: Drill Along Edges
Assuming the holes are close enough together you can easily cut the remainder with a stanley knife or boxcutter.
Step 4: Trim and Sand/file the Hole
Having ran my knife around the edge of the original outline it was really easy to push the knife down to trim off the excess to the right shape.
I could then easily test fit the hole against my flashgun and trim a little more off as needed.
Finally I use a small file to smooth off the edges.
Step 5: Reapply the Underside Sticker.
Step 6: Foil the Rear Side.
This stuff can be a bit tricky to work with, but working in small sections allows you to get the job done. Any holes or tears can be easily patched up after.
At this point I placed the white plastic port cover in place and used to tape to stick it and hold it in place. It doesn't need to be perfect, because the screw we will be putting back in holds it in place.
Once done trim off the excess around the edge and in the middle hole.
I then took the time to smooth it all down.
Step 7: Reassemble to Finish.
I found placing the diffuser about 10mm onto the end of the flash worked best, if you push it too far on then the flash ends up right up against the front, which doesn't make full use of the diffuser.
The diffuser works a treat, its probably the best build quality of any flash diffuser I have used. It creates a nice big diffused light that looks great in eye reflections. Plus you are up-cycling a non working outdated bit of tech.
Have you got a diy flash diffuser that you use for your photos? Get an instructable up! We can never have enough flash diffusers.