Qpcard is first and foremost a gray balancing calibration paper, You can also use it to make sure you don't blow highlights/shadows. The Qpcard is made out of thin plastic, and painted with accurate white, black and gray. It has a self adhesive strip on the back, so you can stick it to walls etc. It comes in packages of 3, for the 101.
Size. 142mm x 40mm
A very easy to use product, If the product had a better build quality this product would be a winner. That said, my cards are still usable, but for the price paid you want something that last longer and function 100%. On my 3 cards there seem to be the gray part which is the worst. I don't know if the cards I got was a bad sample or not. That said this product is definitely ok, as you can see in the sample pictures below.
Images have been imported to photoshop CS3 through Capture NX 2 thus leaving the original image settings as shot, I. E white balance, sharpening, etc .etc. Full resolution sample images are in RGB color mode. Check out my copyright page for information about usage of these images.
Camera: Nikon D2H, Lens 15mm f/2.8 White balance: manual 5600K