Dark field, front light illumination

In dark field, front light illumination, reflected light is not collected by the optics. In this way, only scattered light is captured, enhancing the non-planar features of the surface as brighter characteristics on a dark background (the dark field - see Fig. 11 and 13.a - 13.b ).

Again, this effect is commonly reproduced by means of low angle ringlights (Fig. 12).

Front dark field
Low angle ringlight
Front dark field sample
Front dark field sample2
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