> For the complete documentation index, see [llms.txt](https://docs.d5render.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.d5render.com/user-guide/view/what-is-the-feature-of-horizontal-and-vertical-fov.md).

# What is the feature of horizontal and vertical FOV?

<mark style="background-color:purple;">In the camera parameters in the upper right corner of the window, the FOV parameter is used to adjust the size of the</mark> <mark style="background-color:purple;"></mark><mark style="background-color:purple;">**Field of View (FOV)**</mark><mark style="background-color:purple;">.</mark>&#x20;

* The default FOV is 90° horizontal.&#x20;
* You can switch between horizontal and vertical field of view with the button to the right of FOV.

<div align="left"><figure><img src="/files/YInN2cjiFzkIwGaakaTd" alt=""><figcaption></figcaption></figure></div>

<div align="left"><figure><img src="/files/3H8dS5GltQ5cuMoJjsFv" alt=""><figcaption></figcaption></figure></div>

## FOV (Horizontal)

Horizontal FOV is locked when the viewport is changed, vertical FOV can be changed freely.

## FOV (Vertical)

Vertical FOV is locked when the viewport is changed, horizontal FOV can be changed freely.

## The value of FOV

In fact, the effect of decreasing FOV is also known as Zoom-in, and the effect of increasing FOV is also known as Zoom-out.

* **The smaller the FOV**, the smaller the field of view, the smaller the display will be, and **the objects in the original image will be "enlarged"** as a result.
* **The larger the FOV**, the larger the field of view, the larger the display will be, and **the objects in the original image will be "shrink"** as a result.

## Common issues

### Q: How to match real and rendered cameras?

Matching real and rendered cameras in D5 can be done by adjusting the "Camera" -> "Focus" parameter to align the frames.

The focal length parameter corresponds to the 35mm film equivalent. You can get the same field of view by entering the meta-information focal length of a real photo into the D5 and matching it to the equivalent parameters of a real-world lens.

<div align="left"><figure><img src="/files/v1TbjI5eekpc2l3RZtia" alt=""><figcaption></figcaption></figure></div>

Similar issue: What is the difference between horizontal and vertical FOV? How to switch?