High-power "precision eye": NA=0.42, close to the lower limit of oil immersion lenses, with a resolution of 0.7μm, reaching submicron depth; Narrow depth of focus: ±1.6μm, requiring flatter samples, suitable for ultra-thin sections or fine focusing.

Applied to the observation of organelle details (such as the Golgi apparatus), virus particles (after staining), and metal phase boundaries.