Zeiss 0.63× front‑optic / attachment lens — Part No. 435264‑9150‑000. Designed to deliver a lower-magnification, wide‑field view for compatible Zeiss stereo‑microscopes (e.g. Stemi 508 / Stemi 305‑class stands with interchangeable optics). Provides increased working distance and a broader field of view, making it ideal for macro‑scale observation, dissection, specimen inspection, and documentation workflows. Optical surfaces and mount condition are clean; produces clear, distortion‑free stereo image when properly mounted.