The OBL series is characterized by its infinity optics, making it ideal for all transmitted light applications for more demanding users. The robust and ergonomic stand ensures safe and comfortable operation. Depending on the application, models are available with a powerful, continuously dimmable 3W LED or a 20W halogen light source. The fixed pre-centered and focusable 1.25 Abbe condenser with aperture and field diaphragm allows for simplified Köhler illumination without the need to adjust the center. The large mechanical stage and its specimen holder can accommodate up to two specimens simultaneously and can be quickly and easily focused using a dual coaxial coarse and fine adjustment. A wide range of eyepieces, objectives, and color filters, as well as a dark field condenser, a simple polarization unit, various phase contrast sets, and HBO and LED fluorescence units are available as accessories. Application areas include hematology, urology, gynecology, dermatology, pathology, microbiology, parasitology, immunology, wastewater treatment, oncology, entomology, veterinary medicine, water analysis, and breweries. Applications/specimens include translucent and thin, low-contrast, demanding preparations (e.g., living mammalian cells, bacteria, tissues).