:frown: :frown: I am bit confused to be honest. Can any one explain how Center-Weighted Metering calculates the exposure? I understood that unlike Matrix Metering, SPOT Metering set the tonal value of the metered area to Middle Tone ( 18% approx ). It is our responsibility to compensate the exposure to match the Tonal value we like. If I am not wrong Center-Weighted Metering also uses the " Middle Tone ( 18% approx )" exposure calculation method. But how the final exposure is arrived? since "Camera meters entire frame but assigns greatest weight to area in center of frame (Default 8mm)" as stated in D300 User Guide? Thom's Guide talks about 75% & 25% and gave an example- I couldn't clearly understand what is happening really in calculation of exposure. I would appreciate if any one explain the above, probably with an example?