Leica TL BFDF

Continuously adjustable change-over between brightfield and darkfield

The Leica TL BFDF base features continuously adjustable changeover between brightfield and darkfield, providing high contrast for stained amplitude specimens. It also offers versatile options. The light rays can be deflected through the object from steep to flat and a high or low degree of diffusion can be selected. For example, if the light rays are deflected absolutely vertically through the object, an exact brightfield with maximum brightness is created. The specimen appears with full contrast and in natural color on a bright, homogeneous background.

Detailed Description

If the light is deflected through the object at an oblique angle, however, this makes it easier to view semitransparent objects such as foraminifera and fish eggs. The flatter the light rays are deflected into the objects the darker the background appears. Contours, fine edges and structures are brightly and clearly emphasized by diffraction of the light on the dark background.