Description The 90mm f/4.5 Apo Digitar Lens with Adapter Board from NOVOFLEX fits the BAL-F bellows system for DSLR and mirrorless camera bodies. The 90mm lens, which is optimized for digital cameras, provides focusing ranges from infinity to 1:1 magnification. The lens is preassembled with a NOVOFLEX adapter board to fit the BAL-F system. The Apo Digitar 90mm lens is designed for digital backs and is ideal for shooting with smaller format cameras such as DSLR and mirrorless due to its extremely fine image circle that can concentrate the image on the relatively small sensor in a full frame or APS-C sensor. Its image circle is a constant 90mm throughout the aperture range, including at f/4.5. The lens' small rear barrel with minimal flange allows its use on a variety of cameras.