ExpoDisc EXPOD67 67mm ExpoDisc Neutral White Balance Filter Review

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(More customer reviews)I purchased ExpoDisc 72mm. Here is test result, using Photoshop:
SETUP: Took a gray frame under incident light source per ExpoDisc instruction, using camera Canon EOS 40D, 28-135mm lens.
IMPORT to Canon software "Digital Photo Professional" FOR WHITE BALANCE: Use this gray frame to do white balance itself. A result of a final Gray Frame.
IMPORT this final gray frame to Photoshop FOR MEASUREMENT: Using Photoshop Color Sampler Tool.
Result finding in 256 color scale (0 - 255):
Green & Blue = Mostly about equal.
Red = Always about 10 (in 256) value higher than the other two.
Example:
Green = 112
Blue = 114
Red = 124
I repeated this type of test several more times, result are still much off from scientific theory or way out of range (10 in a range of 256 or 4% error from neutral).
Supposely: Red = Green = Blue to call Neutral.
So this ExpoDisc is for convienent only. OK for none important picture. Way too high price for a non-precision piece.


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The ExpoDisc white balance filter allows digital photographers to quickly and easily set an accurate custom white balance. Each ExpoDisc is individually assembled, calibrated and certified for neutrality in the visible spectrum, and for 18% light transmission. The ExpoDisc can be used on-the-fly to set a white balance in-camera when shooting JPEG, or later in post production when shooting RAW. Using an ExpoDisc to set a custom white balance results in consistently balanced color and eliminates many of the yellow, red and blue color casts commonly seen in digital photography. The ExpoDisc is easy to use. Setting a white balance with the ExpoDisc eliminates many of the inconsistencies and inconveniences associated with using white balance cards and targets, including unwieldy size, unwanted reflectivity, improper angling, and shadows. To set a white balance with an ExpoDisc, simply take a photograph of the light source (incident light) through the ExpoDisc, then follow your camera's instructions to set the camera's custom white balance.Because the ExpoDisc is calibrated for an 18% light transmission, you can also use it as a reference tool for manually determining proper exposure.The ExpoDisc is available in a variety of sizes to fit most popular lenses. The ExpoDisc does not thread into the lens; instead, its quick mount design can be pushed-on and popped-off to facilitate a quick white balance.

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