FODSLR Photo Black White Gray Grey Balance Card Set for Digital Photography (Pocket-Sized, 2" x 3") 18% Gray Card

I used these cards extensively for a few weeks. I'm not convinced the grey card is as true as it needs to be for accurate white balance correction in post processing. I would consider looking elsewhere depending on how accurate you desire your white balance to be. If you are just trying to get a good improvement, then these should work. If you are trying to match colors with are concerned about color accuracy then I'm not sure these will get the job done for you. FODSLR Photo Black white Gray Grey Balance Card Set for Digital Photography (Pocket-sized, 2" x 3") 18% Gray Card

The white and the black card work wonderfully for adjusting exposure / levels in photoshop. The gray card, however is NOT A 50% GRAY and does not work well for adjusting the white balance of a photo in photoshop to the neutral color balance. I wish I would have been more aware of this when I was purchasing the product (the size of the cards are PERFECT)...

They're a little small but I need to use them more and will probably be fine.

n,handy to check not too big ,helps check for color balance.

The cards work as designed. White balance is set quite easily on my Canon DSLR.

Exactly what I wanted to toss into my camera bag. Makes setting a white/grey/black balance in variable lighting conditions easy. I like to shoot one picture at the beginning of a series with these cards visible. Then when I get into Lightroom/Photoshop I can quickly set my white balance.

nice accessory - great price,

Perfect.