There are various types of optical filters used on camera lenses.
For example, this black glass filter is relatively expensive, and has a silver-coated side due to the thin-film deposition.
Another type is blue glass, which offers superior color reproduction, and its price is also relatively high.
This one is ordinary glass, currently the most widely used material in lenses.
Each type operates within different wavelength ranges, but what are their specific functions?
Black filters mainly serve four purposes for lenses:
- First,to adjust light and control brightness, preventing overexposure, and also to use different colored filters to adjust modify color temperature;
- second,to optimize color performance, as certain bias filters can enhance color saturation, and some filters can also change color balance;
- third, to alter visual effects, as color filters can reduce glare and ghosting, while specialized filters can create unique visual effects;
- fourth,to protect the lens, preventing dust and other contaminants from reaching the lens and reducing damage to the internal components from light reflections. They can also conceal the lens.