
Chapter 6: Shutdown and Maintenance 231
Cleaning the Optical Filters
Optical filters should be inspected occasionally and cleaned as necessary. The
frequency will depend on how often the filters are handled.
1 Wrap a triangular section of the lens paper around the cotton end of a
cotton swab. Moisten and seal the end with a few drops of alcohol.
2 Holding the cotton swab in a horizontal position, gently rub any spots on
the filter surface and wipe clean.
3 Allow the solvent to evaporate and check the filter surface for streaks.
4 Inspect a ¼-inch–diameter section in the center of the filter for scratches.
Filters are coated with different dielectrics that can get scratched. If you see
scratches, replace the filter.
5 Insert the cleaned filter into the octagon or trigon.
Make sure the filters are pushed all the way in.
When cleaning or replacing a filter, handle with care to avoid scratching the
surface and to prevent the filter from falling out of the holder. Use cotton
swabs, optical lens paper, and spectral-grade methanol or absolute ethanol
in a dropper bottle (do not use acetone) to clean the optical filters.
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