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Plexiglass is manufactured by Rohm&Hass and Lucite by Dupont, they are both acrylic. Lexan is manufactured by GE. They also sell the resin to Sheffield Plastics. Both are polycarbonate. Acrylic is more subject to cracking when worked. Polycarbonate is anhydrous and is very workable. Will not shatter or crack.
Depth of field extends 1/3 in front of the subject and 2/3 behind. The actual measurement of depth of field in inches is determined by the aperture you set on the lens. The smaller the aperture the broader the depth of field.
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