Gretagmacbeth Colour Checkers

[Del_CtrlnoAlt]

http://www.cathayphoto.com.sg/viewfinder/read/2005,01,4

i wonder whats the price of these sold at cathay and are they useful for getting accurate white balance?

 

[grantyale]

I guess a 18% gray card will help white balancing. However, technically neutral colors may not be always desirable.
The color checkers will be more useful if you want to profile your camera though.

 

[Del_CtrlnoAlt]

thought 18% grey is for estimating the exposure? den the white card is for white balance? i dunno about the black one...