Customer Reviews

ExpoDisc EXPOD67 67mm ExpoDisc Neutral White Balance Filter

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I like shooting in JPGs to avoid playing around in photo editing software after shooting RAW. For complicated lighting, this expo disc is a must have. For professionals, who take pictures for a living, this is not a perfect solution, since it only averages the different light sources and turn it into gray pre-set for your camera. But for the rest of us who just like to take almost-pro like pictures without having to deal with a lot of complicated steps before we snap the shutter, then this is a keeper.

There are several ways to achieve white balance and the ExpoDisc is perhaps the quickest and most convenient. Whether you are an amateur or a professional, the ExpoDisc when used correctly is going to give great results every time. This is a great tool to have in my photography arsenal because it is so light weight and small. I keep other white balance techniques and accessories handy, but now I reach for the ExpoDisc first. Its a professional photography tool that can certainly help an amateur or intermediate shutter bug catch up with the pack. If you're still working on collecting lenses, buy a bigger disc that your lens biggest opening, in case you end up buying larger lenses in the future; in that you can get the same great results by holding the ExpoDisc over the lens as you would if it locked into your lens.

ExpoDisc EXPOD67 67mm ExpoDisc Neutral White Balance Filter

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.