Customer Reviews

58mm ExpoDisc Neutral White Balance Filter

5 star:		(1)
4 star:		(0)
3 star:		(1)
2 star:		(1)
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This product works amazing. Currently in my photo class we are going over white balance and we did some testing. we shot a gray card (has black, 18% gray, and white) and set that as our custom white balance and it worked good. We then shot just the 18% gray. We then used the expodisc and the results were almost night and day. The white balance was perfect. the whole class was amazed. the ease of this product can not be surpassed, your shots will come out noticeably different. I would whole heartedly recommend this product to anyone who is shooting digital.

this product was one of those trial and error buys. I wasted money on this item because i heard so many great things about this product in general from a few local photographers. Wow was I let down. It wasn't helpful by any means and is more of a hassle to to work with then just spot metering or using a target which basically is what this thing is. Not a great buy. The company shipped it fast and was in great condition but the product it's self was lame.

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.