Before I used this product I used white paper as recommendedby Canon for my 30D. I put lines on the paper for focus andset white balance as custom. The paper was difficult to useand keep with me. Since buying the gray digital card, I havefound it to be more accurate than white paper and easier touse. The digital gray card produces perfect custom whitebalance and works every time. It has a focus spot to get thecorrect image for setting up in-camera custom white balance.One time I used both the gray card and the white card (onthe lanyard) and found the gray card produced the correctwhite balance over the white card. Now I never take a shotwithout setting the custom white balance to the gray card. Ido this in-camera so I don't have to make adjustments inpost processing. The gray card also gives the correct lightreflection for digital camera exposure. Most books say thegray card should reflect at 18%, but that is not correct fordigital. See article on the internet by Thom Hogan who says digital camera makers set exposure meters to near12% gray reflectance, 18% is based on printing standards.This gray card is closer to 12% and is very accurate.I like the lanyard. When I'm outdoors I keep it on my neckso I can periodically reset the custom white balance as Ishoot. Inside under lights, I use it one time and I'm setfor the shoot. I highly recommend this card for seriousphotography, and it is inexpensive as photo equipment goes. Expertise: Advanced / non-pro

Being a Photography Student this is my first time dealing with the set of 3 cards but as soon as I learn what they are for I'll write a more favorable review but I can say the cards came in a timely fashion and so far they are primed and ready to be used lol. thanks B&H

I am a Photographer & Videographer and I use this set of grey cards to adjust my White Balance, Mids and Blacks in Post using PS CS5 and FCP7. I find this set to be the most convenient set you can find because of its size and because it's on a very premium landyard that allows you to carry along with ease. If I'm out on a shoot I just throw the landyard around my neck and use it accordingly. It's all about preference for most people. Some people might prefer to have very large grey cards but I find this set to be just perfect for my liking. The size of this set of Grey cards is about the size of a Baseball card.

I'm no pro, but these things are rock solid, and work really well for me.

My 400d calibrated the white balance very accurately with this card. Every shot has pretty accurate white balance. My only concern is it should be a bit bigger.

These white balance cards were just what I needed to round out my kit. I had previously relied on a white foam core sample (yikes!) so I was in desperate need for some real white balance cards. These are very durable and come with a handy lanyard to keep them together. I have been very pleased with the results and the cost of these cards. Very recommended!

The cards are so easy to use. Perfect size.. and colors are spot on!

I love the compact size! Very easy to slide into your back pocket or utilize the lanyard and just wear it around your neck! Also stashes away in your bag easily!

Helps to set accurate color ballence in mixed lighting areas with both floresent and other lighting mixes to set accurate color with your editing software.

its fits easily into the pocket. Saves considerable effort in determining the white,mid grey and black points..