Exposing for white subjects on white or very light backgrounds has to be thought out carefully. If you use no exposure compensation, the pictures will be dark for sure. Therefore, you have to compensate for the expected underexposure by overexposing the pictures based on what the meter is telling you. However, the question is, 'How much overexposure is needed'? The answer depends on the angle of the light, the reflectivity of the subjects, how much of the frame is filled with white, etc. Since it's impossible to quantify these factors, the only way to know is to look at the LCD monitor on the back of the camera and then adjust the exposure according to what you see. For this picture I used a + 1/3 adjustment. This isn't much, but I like my pictures a bit dark so I can protect the vulnerable highlights. I then adjust the exposure to taste in Adobe Camera Raw.
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