Just picked up a "ONE SHOT" digital target calibrator from www.photovisionvideo.com
The unit combines gray, white and black targets for use with your histogram to set WB and check exposure.
Don't about the unit you mentioned.

Came across an expo disc in my old darkroom equip. Used it with my 23c. I use it in combination with a grey card filling most of the field when doing potraits. Colors are right on. Wish I could recycle more items from my old wet darkroom.

Came across an expo disc in my old darkroom equip. Used it with my 23c. I use it in combination with a gray card filling most of the field when doing portraits. Colors are right on. Wish I could recycle more items from my old wet darkroom.

The Expo Disk is used for setting an accurate custom white balance in a shooting situation where the light isn't going to change. And speaking of recycling, you can do something similar with the MacBeth Color Checker by using it in a test picture with any white balance setting other than auto. Then in Photoshop you adjust using a point selection and batch process to correct the color for the entire shoot.

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I randomly came across a white balance filter called the Expo Disc online. Any other thoughts??

I too just ran across the Expo Disk at our local camera shop. I was told that all you had to do was put it on the camera, shoot a shot that would allow you to calibrate your camera's white balance in the difficult light setting. You can then save the information in a custom white balance and you should be able to have good colors even with odd lighting sources. I have not tried it but it seemed way easier than using white cards and the like. I wish I had one yesterday when I was shooting in a setting that had 4 differing light sources. The retail cost locally is $100. The sales person was very positive about it from the perspective that you can eliminate a lot of PhotoShop time after shooting difficult settings. I hope this helps. --pat

I own the ExpoDisc and find it to be a big time saver. Just pop it on the end of your lens at the beginning of a shoot and set the custom white balance and your set. You do have to remember to re-set the white balance if you change location from indoors to outdoors for instance, or if you start using fill flash... But that is a small price to pay to not have to worry if you have the right white balance or god forbid you use auto white balance.

The expodisc comes with a nice lanyard to hang around your neck so it is handy.

If you do not need the technically correct and tested "expodisc" then you can opt for the expo cap which is simply a lens cap with a expodisc built in. They do not certify the accuracy of the expocap however. Handy idea in any case.

I bought an ExpoDisc at the local camera store last year, and have used it rather extensively with my 10D. It has helped me get a good white balance in a variety of conditions, and is a whole lot easier (IMHO) than using gray cards. I plan on buying the "warm ExpoDisc" for those times I want a warmish cast to the image.

-EdT.

I started using the Expo Disc last summer during racing season, it drastically cut down my post production time. Yes it is a little on the expensive side but if you need accurate color and white balance, and want to reduce your post production time and make more money because you in front of the computer less, it is indispensable.

I agree with the rest of the posters....the expodisc is a great time saver and a very valuable tool for those who prefer to "get it right in the camera" and limit their post production time to correcting things that cannot be dealt with at the time of capture.