There are several "homemade" versions of a white balance filters. Some use the lid from a Pringles potato chip can, some use coffee filters...but Tom Hicks developed what I believe to be the best DIY WB disc...the "Hickspodisc"
Materials:
Two 72mm UV-0 or Clear Protective filters*
.125mm (or thinner) Acrylic diffuser panel for fluorescent ceiling light (supposedly available at Home Depot).
3M "P-95" Respirator Filter .(available at paint stores like Sherwin Williams...sold in boxes of 10)
Tools:
Tin snips (or heavy duty scissors)
Dremel tool (or heavy grit sand paper)
Clear adhesive (thicker consistency works better)
*77mm (pictured below) is the largest recommended lens filter. The P-95 material isn't IMAGE IS A REDIRECT OR MISSING!
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Please note: The diffuser material is optional and does NOT effect the performance of the WB disc...I added it for cosmetic purposes only.
I traced the outer diameter of the 72mm UV on the smooth side of the acrylic panel, scored the marking with a utility knife, cut WIDE around it using tin snips, then carefully clipped down to the scored edge with small wire cutters. I smoothed the rough edge and reduced it down to fit inside the front of the Bower filter with my Dremel tool, then glued it in place using marine grade silicone adhesive. I then cut the P-95 filter to fit between the two 72mm filters and screwed them together.
VoilĂ ...a Hickspodisc.IMAGE IS A REDIRECT OR MISSING!
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In case you're wondering if its just as good as an "Expodisc"...check out the histogram results below.IMAGE IS A REDIRECT OR MISSING!
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EDIT: Sorry, but I'm no longer making the hickspodisc. Nerve damage from a motorcycle crash many years ago has finally caught up with me and I'm loosing strength in my hands. Even simple tasks have become quite difficult.