What are the design parameters of camera aperture?

What are the camera lens parameters?

Camera lens parameters

1. Clarity

Sharpness refers to the details and shadow patterns on the image. The clarity of its boundaries. Usually those with a resolution above 720P are called high-definition cameras.

2. Illuminance

Illumination refers to the degree to which an object is illuminated vertically. It is expressed by the luminous flux received per unit area. The unit is lux (Lux, lx), that is, lm/ m2.

3. Electronic shutter

The electronic shutter uses electronic technology to control the generation and transfer of charges on the CCD chip over time, thereby obtaining the "shutter" effect. Can be used with lenses to extend camera sensitivity range.

4. Strong light suppression

High light suppression uses DSP technology, which simply means weakening the strong light part and brightening the dark light part to achieve light balance.

5. White balance

White balance is an indicator that describes the accuracy of white produced by mixing the three primary colors of red, green, and blue in a monitor.

6. Backlight compensation

The essence of backlight compensation is to appropriately adjust the gain of the camera and the charge accumulation time of the CCD according to the brightness of the image.

7. Wide dynamic range

Wide dynamic technology is a technology that allows the camera to see the characteristics of the image under very strong contrast.

Camera lens recommendations

1. Canon EF50mmf/1.2LUSM

The Canon EF50mmf/1.2LUSM lens adopts an internal focusing design, so that the lens body can Get maximum protection. Because it has a large aperture of F1.2, the filter diameter is 72mm and the weight reaches 590 grams. However, the appearance design is very eye-catching, and the lens size is very suitable for use with Canon's full-frame body. At the same time, the focus ring feels soft and smooth, and it feels very comfortable to hold.

The biggest highlight of the Canon EF50mmf/1.2LUSM lens is its F1.2 large aperture design and excellent focusing performance. The large aperture of F1.2 can bring unparalleled blur effect, and the outstanding color performance makes the photos taken more detailed and vivid, and the lens' out-of-focus performance is very soft, which is very suitable for portraits and still scene shooting; At the same time, the lens has a built-in high-speed CPU and a ring-shaped ultrasonic motor, which makes focusing very smooth. In actual shooting, you almost don’t feel the bulkiness of a large aperture lens, and you can focus quickly and quietly when shooting any scene.

2. Nikon AF-Snikkor24-70mmf/2.8GED

This Nikon AF-Snikkor24-70mmf/2.8G lens has a practical golden focal length and high-quality imaging performance. The lens has become a must-have lens for a full-frame SLR, and many enthusiasts have equipped it as a camera head because of its high practicality. It is a rare and excellent lens for full-frame cameras.

As a constant aperture lens, NIKKOR AF-S24-70mm/F2.8G has strong versatility on full-frame bodies, and on DX format, the equivalent focal length is 36-105mm The focal length can also meet most shooting requirements. At the same time, this lens uses Nikon's unique Silent Wave Motor, which makes autofocus both fast and quiet. Full-time manual focus function support allows the lens to switch directly from autofocus to manual focus even in AF servo mode.

Camera parameters are generally divided into EV, shutter speed (shutter), aperture, and ISO.

EV value: a quantity that reflects the amount of exposure. When the EV value rises or falls, the shutter and aperture will be adjusted accordingly. The greater the EV value, the brighter the picture;

Shutter speed ( shutter): represents the length of exposure time. Usually under sufficient light conditions, the shorter the exposure time required;

Aperture: used to control the amount of light passing through the lens and entering the photosensitive surface of the body device, under the same ISO and shutter conditions, the larger the aperture, the brighter the picture will be;

ISO: sensitivity, the higher the sensitivity value, the more light will be received, at the same aperture and shutter speed Under shutter conditions, the picture will become brighter as the brightness increases. Correspondingly, the noise (graininess) of the picture will also increase.

How to set the camera parameters in the studio?

The camera parameter settings in the studio are as follows:

1. Adjust the color temperature to the same as the studio lights.

2. The aperture is determined according to the optimal aperture of each lens. Generally, it is 8-11, which provides the best image quality.

3. The fastest shutter speed does not exceed 1/250, and the flash synchronization cannot be synchronized. The slowest shutter speed depends on the situation. The lower the better, 100-200 is more appropriate.

4. In most cases when shooting in the studio, the camera cannot meter the light synchronously with the studio light. You can only adjust it by looking at the histogram, unless there is an external light meter.

5. Central automatic point focus, manual.

Extended information:

When using the Canon 550D18-55 lens to shoot still life on metal surfaces, pay attention to the following points:

1. Use the 18-end lens and move the camera to Minimum focusing distance (macro mode);

2. Do not point the lens vertically at the metal surface;

3. Do not use flash to fill light;

4. Use a tripod.

Baidu Encyclopedia-Canon 550D

What do the lens aperture parameters of digital cameras mean?

The parameter is the aperture range.

Aperture values ??F2.8, F8, F16, etc. are aperture coefficients.

Aperture is a device used to control the amount of light that passes through the lens and enters the photosensitive surface of the camera body. It is usually inside the lens.

We use the F value to express the aperture size. Aperture F value = focal length of the lens/diameter of the lens aperture. From the above formula, we can know that to achieve the same aperture F value, the aperture of a long focal length lens must be larger than that of a short focal length lens.

When the physical aperture of the aperture remains unchanged, the farther the distance between the lens center and the photosensitive device, the smaller the F number. On the contrary, the closer the distance between the lens center and the photosensitive device, the greater the optical density reaching the photosensitive device through the aperture. The higher the value, the greater the F number.

A camera is a device that uses optical imaging principles to form images and uses film to record the images. It is an optical instrument used for photography. In modern social life, there are many devices that can record images, and they all have the characteristics of cameras, such as medical imaging equipment, astronomical observation equipment, etc.

What technical parameters need to be set before the camera shoots?

Before shooting, the photographer needs to set the following technical parameters:

Exposure: Exposure is one of the basic techniques of photography. The three parameters of exposure time, aperture and ISO are the key to adjusting exposure. Reasonable exposure can ensure appropriate brightness and contrast of the photo, making the photo clearer and brighter.

Focus: Focus is an important factor in ensuring clear photos. The position of the focus point, focus mode and focusing method all affect the clarity of the photo. The photographer needs to make focus settings based on the position of the subject and the focus that needs to be expressed.

White balance: White balance refers to the camera adjusting the light of the shooting environment to ensure that the color of the photo is true and natural. Photographers need to adjust the white balance according to the lighting conditions of the shooting environment.

Color space: Photographers need to set an appropriate color space according to the color space of the photo output device to ensure the accuracy and consistency of photo color.

Shutter speed: The shutter speed setting will affect the clarity and dynamic effect of the photo. Photos with slower shutter speeds will blur the motion of the subject, while photos with faster shutter speeds can capture high-speed moving subjects.

Focal length and lens: Photographers need to choose the appropriate lens and focal length based on the distance of the subject and the focus that needs to be expressed to ensure the clarity and visual effect of the photo.

To sum up, the technical parameter settings of the camera before shooting need to consider many factors, including exposure, focus, white balance, color space, shutter speed, focal length and lens, etc.