Amscope 100X (Oil) Infinity-corrected Darkfield Microscope Plan Objective w/ Iris

100X Infinity-corrected Plan Achromatic Objective with Iris Ideal for dark-field applications 0.36-1.25 variable numerical aperture This is a 100X objective lens with a variable-NA iris for applications such as dark-field microscopy. Standard bright-field objective lenses present low contrast due to their high numerical apertures. This lens’ built-in iris provides control over the aperture, varying between 0.36 and 1.25. This allows for the intensity of the dark-field contrast to be easily adjusted. Designed for infinity-corrected microscopes with RMS thread, this lens features both chromatic and spherical corrections, providing sharp, focused images. It is designed to be used with immersion oil, and has a spring nosecone to prevent damage to the lens or specimen. Compatibility Optical System Infinite Reference Focal Length 180mm Mounting Thread RMS 20.32mm Parfocal Distance 45mm Lens Specifications Magnification 100X Numerical Aperture 0.36 to 1.25 Corrections Plan-achromatic Cover-glass Thickness 0.17mm Nosecone Spring Immersion Medium Oil