The 20х/0.40 lens is 0.69 μm. Chromatic aberration is blue and red, spherical aberration for green, and the curvature of the field of view is 90%of the diameter of the field of vision.

The lens is designed for an infinitely adjusted tube length. The parcocal distance is 60 mm. When using 10/22 mm lens, the field of vision is 1.1 mm diameter. The lens is designed to use samples with a 0.17 mm cover plate.

The lower limit of the useful magnification of the microscope is 200x when using 20 object. At a smaller magnification, the details cannot be removed from the pattern in the image made by the lens. The upper limit of the useful magnification is 400x when using 20 object. The greater magnification is "not useful" because it does not bring new details in the pattern of the pattern. Use the 20x/0.40 lens to enlarge between 10x and 20x.

For flat-acromatic lenses, the focus is the same as the center of the image, so the distortion is negligible. This strength is used for digital imaging and pairing with 22 mm high-angle lenses.

It is suitable for studying the structural details of objective samples above 1 µm in a large field of view, e.g. for analyzing purely conceived urine samples.

Compatibility
- Magus Bio 260T Biological Microscope
- Magus Bio DH260 Biological Digital Microscope
- Magus Bio 270T Biological Microscope
- Magus Bio 290T Biological Microscope
- Magus Lum 450l Fluorescent microscope