The Delphi-X Observer series is ideal for daily cytology and anatomic pathology. The 25 mm field of view and the plan apochromatic objectives enable observations with perfect color rendering at high resolving power. The 200 mm focal length tube lens reduces the angle of the light rays passing the optics and as a direct result improves significantly on the chromatic aberration corrections and contrast. The objectives with larger diameter enable much higher numerical apertures, improving the overall resolving power of the optical system. Long working sessions are not a problem due to the ergonomic design and low stage controls for left or righthanded users. Standard models supplied with plan achromatic infinity corrected 4x/0.10, 10x/0.25, 20x/0.40, S40x/0.65, and S100x/1.25 oil immersion EIS objectives.