What is camera focal length, lens? What does it mean to take pictures?

Focal length is the key to getting the photos you want. Let’s find out with lassho.edu.vn what focal length on a camera is and what it means in photography!

What is focal length?

Focal length is the magnification achieved by the lens . Focal length is measured as the distance (in millimeters) between the focal point of the lens and the image sensor (focal area).

Therefore, the focal length is displayed as a number, and it tells you how well the camera can capture within the scene.

Types of focal lengths

There are two common types of lenses:

• Fixed lenses (or Prime lenses): only one focal length available, meaning that the focal length of the lens cannot be changed, and are generally cheaper than zoom lenses.
• Zoom lens : has many focal lengths, allowing the photographer to flexibly adjust the focal length depending on the photography needs. Of course, the price of zoom lenses is also quite expensive.

If the camera focal length is classified according to the shooting angle, there are the following types of lenses:

• Ultra wide angle lens : Focal length between 8mm and 24mm

People call this lens a fisheye lens for a very wide field of view. Although the lens has the ability to take 180-degree images, it causes a lot of distortion in the image.

• Wide-angle lens – standard : Focal length between 24mm and 35mm

This type of lens offers a small focal length, a wide angle of view, and a lot of focus. There is, of course, the possibility of image distortion, but to a lesser extent than with ultra-wide angle lenses.

• Standard lens : Focal length between 35mm and 70mm

This focal length is more commonly used, from portraiture to landscape photography. Because for the ability to display images close to the naked eye. At the same time, it is easy to adjust according to the shallow – deep depth of field.

• Telephoto Lens: Focal length from 70mm to 300mm or more

This type of camera focal length is ideal for shooting a distant subject, working almost like a telescope!

How does focal length affect photography?

Focal length is the degree of magnification achieved by the lens, so it is also one of the factors that greatly affect the photography. Specifically, the focal length affects a number of factors:

View

The focal length determines the extent of the scene represented on a single frame. Therefore, a lens with a small focal length (often called a wide-angle lens) provides a wide depth of field. And conversely, a lens with a large focal length (also known as a telephoto lens) gives a small depth of field.

Depth of field

Focal length affects the sharp area of the image (called depth of field).

For example, a telephoto lens offers a large depth of field, which means it can focus on a very distant subject.

View

When you change the focus, you also change the angle of view and the ratio of the image when shooting. In a word, the small focal length provides a wide angle of view, large image ratio. On the contrary, a larger focal length narrows the angle of view, helping to enlarge the image to show more detail.

Vibration

When taking pictures, it is inevitable that the shot will be blurred due to the shake. Therefore, using a lens with a large focal length and good photography techniques will greatly improve the image without having to use a tripod.

How to choose a lens with the right focal length

Understanding what focal length is and what types of lenses have it, choosing the right camera focal length is also the secret to getting the photos you want.

To choose a lens with the right focal length, you need to redefine the subject (content) you want to capture. Such as:

Travel photography

Choosing a standard zoom lens will give you flexibility in every shot, as most of the time when traveling you need to avoid carrying a lot of bulky things.

Sports photography

Choose the type of telephoto zoom lens that is best for you to capture moments of sports activities from a distance.

Landscape photography

To get satisfactory landscape photos, you have two types of lenses to suit this need: wide-angle (or ultra-wide-angle) lenses and standard lenses.

Take a portrait photo

Choose a lens with a focal length of 35mm to 70mm for the most expressive portraits.

Macro photography

A telephoto lens with a minimum focal length of 200mm will help you get photos that show the most delicate details.

Architectural photography

Choose a standard wide-angle lens to create a good depth of field, helping you capture the entire space in the best way.

Street photography

You can choose a standard fixed lens for street photography. In addition to expressing creativity, you should have the flexibility to use a standard zoom lens for shooting.

Wildlife photography

To capture the gestures of wildlife, you should choose a telephoto zoom lens. It allows you to get naturally beautiful photos without interfering with their daily routine.

Hopefully the above sharing will help you understand what camera focal length is and what it means in photography.