This is an objective lens for Nikon microscopes. The model is: Plan Fluor 40x / 0.75 Ph2 DLL ∞/0.17 WD 0.72. It is ideal for fluorescence observation and imaging, and features high-quality image clarity. It is also versatile in its applications, including brightfield observation, phase contrast, polarization, and differential interference contrast observation. This is a used item, purchased about 10 years ago by a single owner (current model). The storage condition is good, and the lens and exterior are kept clean. There are no noticeable marks on the connection part with the microscope. We hope to deliver this high-performance lens in good condition to those looking for one.