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Thread started 23 Oct 2007 (Tuesday) 02:12
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DIY Expodisc...save $100

 
David ­ John
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Oct 23, 2007 02:12 |  #1

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

wide enough for anything larger than 77mm without splicing extra material...although it won't effect performance if you splice it on the outer edge and AVOID GAPS THAT LET LIGHT THROUGH!!
IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE



For the UV filters I used a larger ringed "Bower" filter (found cheap on eBay) to house the acrylic diffuser and accommodate all three layers of the P-95 material, combined with a thinner Hoya filter to keep the total size as small as possible.

Since my local Home Cheapo didn't have any diffuser panels I contacted the Plaskolite company (who manufacturer the acrylic panels) and asked if I could have some samples...well, samples I got...more than I'll ever need!!
IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE


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 NOT FOUND IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE


In case you're wondering if its just as good as an "Expodisc"...check out the histogram results below.


Expodisc
IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE


Hickspodisc
IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE


Save yourself the $100 and put it towards another L series lens!!

...............

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.


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modemanual
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Oct 23, 2007 02:25 |  #2

great tip! will be putting this to use soon.


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gnrlmike
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Oct 23, 2007 10:53 |  #3

Will you break down the price of materials used?


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Tsmith
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Oct 23, 2007 11:43 as a reply to gnrlmike's post |  #4

Hickspodisc < :lol:



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wonny
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Oct 23, 2007 14:19 |  #5

You should sell them. Let me know how much.


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Fureinku
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Oct 23, 2007 14:43 |  #6

wonny wrote in post #4177735external link
You should sell them. Let me know how much.

I agree..


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ace3
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Omaha, NE
Oct 23, 2007 14:47 |  #7

wonny wrote in post #4177735external link
You should sell them. Let me know how much.

agreed. save everyone from buying a box of 10 filters, as well as everyone contacting Plaskolite & asking for free samples.

:D

Great work!


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rhys
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Oct 23, 2007 14:57 |  #8

Umm... There's a cheaper way of doing that...

Using a piece of coarse sandpaper on a cheap Cokin Skylight filter will produce something very similar.


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Mark_48
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Oct 23, 2007 18:06 as a reply to rhys's post |  #9

After seeing this post I dug out some old diffusion panels I had in the cellar that had been used in fluorescent fixtures. The diffusion material I had is opaque white so I didn't bother with respirator filter material that was used. As an experiment I first took an exposure of my readily available models with room light (AWB setting), which is from energy saving compact fluorescent bulbs. Next I simply held up a 4"x4" piece of the diffusion plastic in front of the lens, took an exposure and did a white balance. Using the new white balance setting I took another shot of the two lovely and willing models.
I've got some more experimenting to do, but what I've got so far seems encouraging. If I can prove to myself that the balance is accurate in most lighting situations, I'll probably try to build something to accomodate the largest lens I have and put a hood on it to act as a shroud over the lens while handholding it.

Thanks for the DIY inspiration :)

Below are the shots uncorrected and corrected.

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Indecent ­ Exposure
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Oct 23, 2007 18:35 |  #10

"Hickspodisc" Haha

Thanks for the DIY.


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Big ­ WIll
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Oct 23, 2007 19:23 |  #11

Yeah i see a new eBay knock off coming :)


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ANGUS
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Oct 24, 2007 07:46 |  #12

I have a WB Card that is like the Expodisk, How do i set the WB? Do i need the disk at the distance of the subject or right infront of the lens??


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ANGUS
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Oct 24, 2007 07:51 |  #13

Sorry mine is not like an Expodisc, Just had a look and its different ill start another thread.


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Ultimate ­ CC
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Oct 24, 2007 07:51 |  #14

emailed...


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David ­ John
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Oct 24, 2007 15:08 |  #15

gnrlmike wrote in post #4176616external link
Will you break down the price of materials used?

This is what I paid.

6 pack 3M p95 Particulate Respirator Filter $10.67 + Tax
Bower UV-0 72mm Lens Filter (eBay) $6.95 + $3.00 S&H
Hoya Standard UV Haze Lens Filter (eBay) $3.99 +$8.00 S&H
Acrylic diffuser panels (Plaskolite) FREE
Silicone adhesive $1.89

Cheap 72mm lens filters can be found on eBay all day long for $8 to $14 including shipping. You DONT need quality glass, its only to keep the 3M filter material clean and dust-free.


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DIY Expodisc...save $100
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