Nikon CFI Plan 50x Oil Immersion Objective

The Nikon 50× Oil Immersion Objective (CFI Plan Achromatic) is a precision optical lens built for demanding microscopy applications where both resolution and contrast are critical. Designed for use with immersion oil, this 50× objective helps overcome optical limitations posed by coverslips and air gaps, enabling superior light collection and image clarity at high magnifications.

With 50× magnification and a high numerical aperture (NA) of 0.95, this objective provides enhanced detail and contrast, making it ideal for biological and material imaging scenarios where fine structural features matter. The CFI Plan Achromatic optical design corrects chromatic and spherical aberrations while maintaining a flat imaging field, delivering uniform sharpness and contrast from center to edge.

Oil immersion objectives like this one improve optical performance by minimizing refractive index mismatch at the glass/coverslip interface, significantly increasing the amount of light that reaches the imaging system — resulting in brighter, higher-resolution images. Its short working distance (approximately 0.20 mm) is optimized for high-NA oil immersion use and is typical for objectives in this class.

Compatible with upright research microscopes using standard RMS threading, the Nikon 50× oil immersion objective integrates seamlessly into brightfield, fluorescence, and other optical imaging workflows.