Leica PL Fluotar 100X Objective - Iris, Infinity Corrected, NA 1.30

The Leica PL Fluotar 100x/1.30 Oil Iris is a fluorite-corrected oil immersion objective with a built-in iris diaphragm — a feature that sets it apart from standard fixed-NA 100x objectives. The iris allows the user to continuously adjust the effective NA of the objective from the maximum 1.30 down to lower values, enabling the same objective to be used for multiple contrast techniques without a nosepiece change. At full aperture (NA 1.30), the objective delivers maximum resolving power and fluorescence light collection for high-resolution brightfield and fluorescence imaging. Stopping down the iris reduces the NA, which can be used to generate darkfield contrast, oblique illumination effects, or increased depth of field for thick or uneven specimens — techniques that would otherwise require a separate darkfield condenser or objective. The PL Fluotar fluorite optical design provides significantly better chromatic and spherical aberration correction than standard achromat objectives, producing sharper images with improved contrast and color fidelity across the visible spectrum. The M25 infinity-corrected thread mount fits all Leica upright and inverted microscopes in the Leica infinity-corrected system. Supplied as a genuine Leica OEM objective (part no. 506009) manufactured in Germany in excellent condition with flawless optics.