NOVOFLEX CASTBAL-PRO is a bellows designed for use with CASTEL-MICRO Auto Stepping Motor Stacking Rail. Using this bellows allows for greater magnification. Recommended for use with flat field lenses such as Schneider Kreuznach APO-DIGITAR 4.5/90mm lens PRO-APO-DIGI-90. Focus stacking results are superior to Scheimpflug adjustments because focus is maintained throughout the image. Perfect for product photography.