Macro White Ff ((full)) -

At 1:1 magnification, your depth of field is paper-thin—often less than a millimeter. If you place a white card behind your subject and light it separately, you must ensure the white card is far enough back to be out of focus, but not so far back that stray light affects your exposure.

Many beginners attempt this technique and end up with a muddy grey background. This happens because they try to light the background and subject with the same source. To achieve true Macro White Ff, you must separate your lighting ratios. Macro White Ff