Nikon CFI Plan Apo 20x Objective, infinity corrected for Eclipse microscopes. Features longer working distance (1.0mm) with high Numerical Aperature (0.75) and is designed to correct all optical abberations throughout the visible spectrum across the 25mm field of view. Superior image flatness and color reproduction, plus resolving power at the limit of today's optical technology. List Price: $1,964.00.