Phase contrast device FATEK M6-7
Phase contrast device FATEK M6-7. A phase-contrast device is intended for studying transparent objects, invisible under normal lighting, in transmitted light on a microscope. This device provides illumination of objects using phase contrast and dark field methods, as well as observation when illuminated using the bright field method. The principle of operation of a phase-contrast device is based on the use of a method of converting the phase shift of rays, invisible to the eye, that occurs when passing through an object, into an amplitude one, noticeable to the eye. The transformation is carried out by a system of special diaphragms installed in the plane of the exit pupil of the lens and in the conjugate plane of the condenser aperture diaphragm. The condenser contains diaphragms in the form of a light ring (light), and the lens contains a diaphragm in the form of a darkened ring (phase). Phase contrast can be positive or negative. With positive phase contrast, structures whose refractive index is higher than that of neighboring areas are visible in the image plane as darker. The device is made by installing a diaphragm-screen in the condenser, cutting off the access of direct rays to the lens. In the presence of a screen, the field of view becomes dark, since the lens collects rays only reflected and scattered by the structures of the object, as a result of which the structures appear light. Manba: https://www.nv-lab.ru/catalog_info.php?ID=6642
- Correction type: Linear magnification and numerical aperture
- Planachromat: 10x0.25
- Planachromat: 40x0.65
- Planachromat: 100x1.25