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• Grun: a green panchromatic filter that was used for contrast enchantment for
B/W photography
These filters were used for film photography and are not useful for digital
photography. However, when using low intensity light (yellowish), DLF-filter adjusts
the light back to the direction of blue, making the image more pleasant to view.
Figure 12. Filter controls marked with red arrows
2.11 Dark-field microscopy
The microscope can be equipped with a dark-field ring that can be used for low-
quality dark-field microscopy. The ring is on the shelf above the microscope. The
installation of the filter is shown in Figure 13. Note that the short label side is facing
up when inserting.
Figure 13. Insertion of the dark-field ring
2.12 Turning off the microscope
When you have finished using the microscope you should:
• Turn off the microscope (Figure 1 on page 1)
• Clean the microscope if needed
• Cover the microscope with the red dust cover