Leica M165 FC, User Manual

Page: 100 / 160

Leica M Series User Manual Bases 100
Setting the relief contrast
The two switches on the left side of the trans-
mitted-light base TL RC/TL RCI activate two
built-in flaps. The outer switch (1) controls the
inverted relief contrast, and the inner switch (2)
adjusts the positive relief contrast.
Depending on the flap position, a part of
the opening of the built-in Fresnel lenses are
covered, which results in the different contrast
effects. Phase structures typically act as spatial,
relief-type images – in the positive relief
contrast like hills, in the inverted relief contrast
like valleys. Increased contrast without relief is attained
if both diaphragms are set to 45°. A gap-like
illuminated area is created. By tilting the deflec-
tion mirror slightly, you can move the gap over
the entire field of view and quickly toggle
between positive and negative relief images.
The dynamic effect makes it easy to distinguish
phase structures from amplitude structures.
Leica TL RC / Leica TL RCI: Operation
1. Switch for adjusting the inverted relief
contrast
2. Switch for adjusting the positive relief
contrast
3. Deflection mirror
1 2 3