How to set exposure compensation for cups in Canon 600D studio?

The photo studio mainly depends on the color of the background and how to measure light to decide whether exposure compensation is needed and how to set exposure compensation.

Usually when shooting cups in the studio, transparent glass is usually shot by polishing on both sides. At this time, if it is a black background, the average or central key is directly used to measure light. In order not to make the black beat gray, the exposure compensation needs to be reduced by 1~2. If the negative with the gray scale of 18% is temporarily placed behind the cup for average or central key metering, there is no need for exposure compensation.

If the background is a middle tone, take a transparent cup and measure light with average or center focus, so there is no need to set exposure compensation.

If it is a white background, take a transparent cup and use the average or center key to measure light. In order to prevent the white dust, it is necessary to adjust the exposure compensation to increase 1~2.

If it is an opaque cup with a large shooting volume, no matter what the background color is, the average or central focus metering is used, and there is no need to adjust the exposure compensation.