What are filters? Meanings of Filter

Rusq.org explains what Filter means

  • Welcome to Rusq.org, which specializes in aggregating all questions and answers what is the definition, discussing and answering what the abbreviation stands for among young people, today let’s learn a new concept that is Filter What is it? Filter meanings. What are filters? How to use filters in photography? What are filters? Why use filters in photography? What is a filter and what are its uses for the camera?
What are filters? Why use filters in photography - Website Rusq
What are filters? Why use filters in photography – Website Rusq

What is Filter Definition?

  • Filter is a filter, used to filter light before entering the sensor. In the spectral range, if analyzed, natural light has many different colors and has a significant impact on photography, so a filter must be used to limit unnecessary colors.
  • A filter is a layer of glass usually attached to the front of the camera lens, for the purpose of protecting the front lens or creating special effects for the image. Depending on the intended use, people will choose an appropriate filter, or combine multiple filters together.
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Below the article would like to introduce some popular filters.

Filter GND (Graduated Neutral Density)

  • The GND filter is another variation of the ND filter that is a zone filter. If Filter ND reduces light intensity from everywhere entering the lens, Filter GND only blocks light intensity from a certain side, depending on the type of filter. Similar to the HDR technique, the GND filter can help us see details in the extreme light, but also does not make the rest of the areas too dark, often used when we are shooting scenes that include the sky. , the horizon and the landscape below ground.

UV Filter (Ultraviolet Filter)

  • This type of filter has the ability to prevent ultraviolet rays from entering the lens. Ultraviolet (UV) rays are invisible to the naked eye, but when entering the camera can damage your image sensor. The UV filter also helps to remove opaque elements such as fog or smoke, reducing the contrast in the image as well as greatly affecting the color. In addition, this type of filter also works to protect the lens from external damage such as dust, water jet or strong impact.

Filter ND (Neutral Density)

  • The ND filter has the effect of reducing the intensity of light entering the lens. Gives the ability to take pictures at a lower speed, creating some really cool effects. There are 2 main types of ND filters:
    Fixed dimming: each ND filter has only a fixed luminosity index (stop) that cannot be changed.
  • Variable ND (Variable ND): is a round ND capable of changing the level of light reduction when rotating 2 filter layers. The large reduction value depends on the different filter type, usually from 5 to 10 stops.

Polarizing Filter (CPL)

  • Not simply reducing light intensity like the ND filter, Polarizing Filter will prevent light rays from traveling from unwanted directions to the lens, eliminating the phenomenon of glare when photographing reflective surfaces.
  • The result of this phenomenon is that we will be able to shoot through the glass, capturing the sky for a better blue, CPL usually has a fixed part attached to the top of the lens, a part can rotate on its own to polarize the light. shining. You have complete control when rotating the CPL around the lens and choosing the best effect for the image.

There are also many different types of filters that serve different purposes in many shooting conditions such as:

  • Close-up Filter ( Close-Up Lens, Macro Filter )
  • Effect filter – Kính lọc hiệu ứng
  • Filter macro
  • Color Correction Filter
  • Black & White filter (for monochrome films filter)
  • Infrared filter

How to use Filters?

  • You can use independent filters, but you can also combine multiple filters at the same time. There is an accessory that helps you combine filters together. When needed, you can combine 3 filters ND, GND and other filters if needed.
  • When you first buy a filter, you will probably want to buy a filter of poor quality, which is a huge waste of your time and money. Filters with poor quality will make your image quality decrease significantly. So invest wisely.
  • The filters you use will depend on how many steps of light you need to reduce, or what areas you need to darken, which areas to lighten. To be sure, you should switch to RAW photography and try taking a few shots without the filter and see the histogram to choose accordingly. A lot of people always use their filter, this is not wrong but it costs you much more time.
  • When shooting waterfalls, always carry a GND filter, because just a longer exposure of more than 1 second can make the image completely different.


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