Tutorials and recommendations
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If images appear darker tan desired:
Don’t touch the filter with your fingers. Don’t press or hit it, because its sensibility.
You can use compressed air to clean it.
An alternative is a paint brush or a microfiber cloth. As a last option, you can use a cotton swab moisten with cleaner liquid.
To achieve an optimal polarization, we recommend to use Columbia or translucent cheek retractors.