The Olympus LUMPlanFI 0.8 is a high-performance, infinity-corrected microscope objective, often a 40x water immersion lens (LUMPlanFl/IR 40x/0.80 W), known for its excellent light-gathering (NA 0.8) and deep-tissue imaging capabilities, long working distance (LWD), flat-field correction, and superior performance in near-infrared (IR) and fluorescence microscopy for neuroscience and live-cell studies, offering sharp, bright images deep inside samples.