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ROCK IMAGER User's Guide | Chapter 6: Imaging Methods
Köhler Illumination with Motorized Aperture
ROCK IMAGER uses the same light source as compound microscopes. With Köhler illumination, lenses
are used to focus the light on the sample. The motorized aperture in the light path can bend the light
from a cone to a column and vice versa for automated contrast adjustment.
A cone of light will produce images with the least shadowing, while a column of light produces images
with the highest contrast.
Motorized Polarizer
To help identify crystals, ROCK IMAGER has a motorized rotating polarizer and a fixed polarizer. The
polarizers are 95% efficient and transmit light of 30% at 400-700 nm.
Köhler Illumination with Motorized Aperture
Cross-polarization Example 1
Cross-polarization Example 2