Labware with high optical quality coverslips is essential for confocal microscopy because image resolution and optical sectioning depend strongly on the refractive index and thickness of the coverslip. The ibidi Polymer Coverslip and the ibidi Glass Coverslip match standard #1.5 and #1.5H coverslip specifications, ensuring optimal performance of high numerical aperture objectives and minimizing optical aberrations. Therefore, all ibidi µ-Slides, µ-Dishes, and µ-Plates with these coverslip bottoms provide ideal conditions for high-resolution fluorescence imaging and reliable 3D cell imaging.