lens hoodPurpose of use
Lens Hood is a commonly used photography accessory installed in front of a camera lens, made of various materials such as metal, hard plastic, and soft rubber. As the name suggests, the function of a light shield is to block excess light. A camera lens is composed of multiple lenses. When sunlight enters the lens, the light continuously reflects between the lenses, resulting in ghosting or a feeling of gray in the photo. Therefore, a light shield can help improve image quality.
The blue line represents the light path during normal phase formation. The gray line represents the surrounding interference light, which is reflected by the bottom of the rear edge of the lens (red line). At this point, the light is reflected forward again by the front edge of the lens, and then returns to the sensor to produce a halo phenomenon.
When light enters the mirror body, it is conical in shape, but the shielding of the mirror body blocks unwanted light from the four sides, making the image rectangular. Therefore, the photo we see will be rectangular instead of circular. From this, we can imagine that the light that enters the mirror and is helpful for imaging should be a rectangular square pyramid instead of a conical shape. Therefore, the light shield is effective in blocking excess light, and photos taken with the light shield installed generally have richer colors and deeper saturation.
Filter out unnecessary light
Types of light shields
1. Petal shaped light shield
The petal shaped light shield is designed to match the viewing angle of the lens, so it is made shorter on the left and right and longer on the top and bottom. The petal shaped light shield is designed to facilitate the formation of the four cornered cone formed by the light rays mentioned earlier.
2. Long cylindrical light shield
The longer the light shield, the better it can isolate the interference of surrounding light sources and reduce halo effects. Therefore, using a long light shield for telephoto lenses helps to concentrate the light entering the lens.
3. Short cylindrical light shield
Relatively speaking, short light shields are more commonly used on wide-angle lenses because wide-angle lenses need to absorb more light than long lenses, thus obtaining a wider range of scenery.
There are different sizes of light shields on the market, and people should purchase suitable light shields according to the size of the lens. For example, for a 52mm lens (note that 52mm does not refer to the focal length of the lens, but the size of the lens), a 52mm light shield should be purchased, and for a 72mm lens, a 72mm light shield should be purchased to match.
The lens size can be found on the lens
The benefits of using a light shield
In addition to blocking excess light, a light shield also has other benefits:
Using a light shield can protect the lens and reduce the chance of accidental contact and damage to the mirror surface;
The light shield can prevent the lens from being affected by rainwater and dust;
When accidentally dropping the lens to the ground, the light shield helps reduce the damage caused by the impact;
When should I not use a light shield?
When using a wide-angle lens and built-in flash light simultaneously, the light shield may block the flash light and form a black shadow;
When using a rotating filter (such as CPL), the light shield may hinder the use of the filter& nbsp;
Lens Hood is a commonly used photography accessory installed in front of a camera lens, made of various materials such as metal, hard plastic, and soft rubber. As the name suggests, the function of a light shield is to block excess light. A camera lens is composed of multiple lenses. When sunlight enters the lens, the light continuously reflects between the lenses, resulting in ghosting or a feeling of gray in the photo. Therefore, a light shield can help improve image quality.
The blue line represents the light path during normal phase formation. The gray line represents the surrounding interference light, which is reflected by the bottom of the rear edge of the lens (red line). At this point, the light is reflected forward again by the front edge of the lens, and then returns to the sensor to produce a halo phenomenon.
When light enters the mirror body, it is conical in shape, but the shielding of the mirror body blocks unwanted light from the four sides, making the image rectangular. Therefore, the photo we see will be rectangular instead of circular. From this, we can imagine that the light that enters the mirror and is helpful for imaging should be a rectangular square pyramid instead of a conical shape. Therefore, the light shield is effective in blocking excess light, and photos taken with the light shield installed generally have richer colors and deeper saturation.
Filter out unnecessary light
Types of light shields
1. Petal shaped light shield
The petal shaped light shield is designed to match the viewing angle of the lens, so it is made shorter on the left and right and longer on the top and bottom. The petal shaped light shield is designed to facilitate the formation of the four cornered cone formed by the light rays mentioned earlier.
2. Long cylindrical light shield
The longer the light shield, the better it can isolate the interference of surrounding light sources and reduce halo effects. Therefore, using a long light shield for telephoto lenses helps to concentrate the light entering the lens.
3. Short cylindrical light shield
Relatively speaking, short light shields are more commonly used on wide-angle lenses because wide-angle lenses need to absorb more light than long lenses, thus obtaining a wider range of scenery.
There are different sizes of light shields on the market, and people should purchase suitable light shields according to the size of the lens. For example, for a 52mm lens (note that 52mm does not refer to the focal length of the lens, but the size of the lens), a 52mm light shield should be purchased, and for a 72mm lens, a 72mm light shield should be purchased to match.
The lens size can be found on the lens
The benefits of using a light shield
In addition to blocking excess light, a light shield also has other benefits:
Using a light shield can protect the lens and reduce the chance of accidental contact and damage to the mirror surface;
The light shield can prevent the lens from being affected by rainwater and dust;
When accidentally dropping the lens to the ground, the light shield helps reduce the damage caused by the impact;
When should I not use a light shield?
When using a wide-angle lens and built-in flash light simultaneously, the light shield may block the flash light and form a black shadow;
When using a rotating filter (such as CPL), the light shield may hinder the use of the filter& nbsp;
