Basic introduction of filters

Filters are the cheapest accessories that can obviously change the appearance of photos.

As the name implies, the filter has the function of filtering light and plays a role of "seasoning" in photography creation. If you can use filters flexibly, you can improve the performance of photographic works. Using filters in black-and-white photography can change the tone of the scene and make the photo closer to nature. The use of filter in color photography can change the color temperature of light source, the color of the subject or play a special visual effect.

Here is how to give full play to the advantages of filters. A filter is actually a piece of glass or plastic placed in front of the camera lens when shooting. There are many kinds of filters, which can be basically divided into several categories: some filters can be used to correct the appearance of photos, others can be used to enhance the effect of photos, and special effects filters can completely change the appearance of photos.

In black-and-white photography, we use filters to brighten or darken the gray tone produced by a certain color on a black-and-white negative or photo. In color photography, the use of filters is more complicated, because the color of the filter itself will affect every color in a photo or slide. But if used properly, it can be proved that the filter is extremely effective in many colorful occasions. First, consider a simple red filter. If you use it to shoot color film, there will be a strong red tone on slides or photos. If we like the red sky instead of the blue sky, we can realize our wish by using the red filter. This is what is commonly called special effects.

However, shooting black and white movies with a red filter is completely different. Because there is only black and white, color can't be reflected in black and white photos, but the tone value of black and white in photos can be changed. For example, if black and white films are shot with the same red filter, the blue sky will appear darker gray tone than the sky shot without the filter. Therefore, the red filter can be used to take black and white photos of the dark gray sky against the rolling white clouds. The result may be a beautiful and natural black and white photo.

We may not understand the mystery, but don't worry. In this lesson, we will discuss in detail the various filters used in shooting color or black-and-white movies.

Let's look at another example: when shooting a bunch of roses with black and white film, if you use the same red filter, you can vividly highlight the red roses from the green leaf background. The result will be a very nice black and white photo, with bright red roses in sharp contrast with dark green leaves.

Therefore, the correct selection of filters is an important creative tool that we can use.

We should also realize that some filters are only suitable for black and white photography, while others are only suitable for color photography. Of course, there are also some filters that are suitable for both, such as polarizing filters.

The trick to using filters is to choose the right filter at the right time. This is the content of this lesson.

There are two basic forms of filters: the most common filter is a transparent colored glass sheet or a plastic sheet embedded in a circular metal frame, and the filter can be screwed to the lens through the thread on the metal frame. Another typical form is a part of the filter system. A certain frame is attached to the front end of the lens. The filter is usually a square colored plastic piece embedded in the frame through the chute.

No matter what kind of filter, the function is the same. The light will change after passing through the filter, and then be projected onto the film through the lens. Because all films record the image of the light projected on the film, changing the light can change the image seen by the film. We know very well that ordinary filters made of colored glass or plastic sheets will change the color of light. But for special filters such as polarization filter, medium gray density filter, multiple shadow filter and starlight effect filter, the color itself has become less important.

In this lesson, we will discuss various types of filters. Now let's get down to business. 1, to prevent glare and reduce eye fatigue.

2, the resolution can be improved

3, play a certain role in heat insulation.