📷 Camera FOV Calculator

A tool to accurately calculate camera Field of View (FOV). Enter sensor size, lens focal length, and shooting distance to calculate horizontal/vertical/diagonal angles and actual coverage area. Useful for photography, CCTV installation, and video production.

Sensor Preset

Sensor Width (mm)

Sensor Height (mm)

Focal Length (mm)

Focal Length Preset

Shooting Distance (m)

Coverage Area

—

Angle of View

Horizontal Angle — Vertical Angle — Diagonal Angle —

Field of View Coverage

Horizontal Width — Vertical Height — Diagonal Length —

Angle of View

Calculation Formula
Angle = 2 × arctan(Sensor / (2 × Focal Length))
FOV = 2 × Distance × tan(Angle/2)

指南

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What is Camera Field of View (FOV) and Why It Matters

Camera Field of View (FOV) refers to the extent of the observable world that a camera can capture at once. FOV is determined by the lens focal length and camera sensor size, expressed in degrees. For example, a 50mm lens on a full-frame camera provides a horizontal FOV of about 40 degrees, but the same lens on an APS-C camera narrows to about 27 degrees. FOV is a crucial element in photography and videography. Wide FOV (wide angle) is suitable for landscapes, architecture, and group photos, while narrow FOV (telephoto) is advantageous for portraits, wildlife, and sports. FOV calculation is essential for professional work like CCTV installation, drone photography, studio setup, and event coverage.

Sensor Size FOV Differences and Understanding Crop Factor

Camera sensor size directly impacts FOV. Full-frame sensors (36×24mm) are the same size as 35mm film and provide the widest FOV. APS-C sensors have a crop factor of about 1.5-1.6x compared to full-frame, with Canon at 1.6x and Nikon/Sony at 1.5x. Micro Four Thirds sensors have a 2.0x crop factor. Crop factor indicates how FOV changes when mounting the same lens on different sensors. A 50mm lens on APS-C Canon (1.6x) narrows to 80mm equivalent FOV. Smartphone cameras use very small sensors like 1/2.3" or 1/1.7", resulting in crop factors of 5-7x. Recent flagship smartphones incorporate 1-inch class sensors to reduce crop factor to 2.7x and improve image quality.

FOV and Applications by Focal Length - Wide to Super Telephoto

FOV and applications vary completely by focal length. Ultra-wide (14-24mm) provides horizontal FOV over 90 degrees, essential for landscape, architecture, and real estate photography. Wide angle (24-35mm) offers horizontal FOV of 60-84 degrees, suitable for street photography, documentary, and travel. 35mm is the FOV closest to "human vision" and particularly popular in street photography. Standard (50mm) provides horizontal FOV around 40 degrees, widely used for portraits, food, and product photography. Telephoto (70-200mm) offers horizontal FOV of 12-29 degrees, suitable for portrait close-ups, sports, and wildlife. Super telephoto (300mm+) has FOV below 8 degrees, dedicated to bird, wildlife, and long-distance sports photography.

Practical FOV Calculation Guide for CCTV Installation

FOV calculation is essential for CCTV installation. Accurately understanding surveillance coverage helps determine camera quantity and positions for complete monitoring without blind spots. CCTV typically uses 2.8mm lenses (horizontal FOV ~90°), 3.6mm (~80°), 6mm (~50°), 8mm (~40°), and 12mm (~25°). Indoor spaces (stores, offices) suit wide FOV 2.8-3.6mm lenses. Shooting from 3m height with a 2.8mm lens covers approximately 10m horizontally and 7m vertically. Outdoor long-distance surveillance requires 8-12mm lenses. Using a FOV calculator allows accurate coverage simulation before installation.

FOV Utilization Tips for Drone and Action Camera Shooting

In drone photography, FOV is a key element determining shooting style. DJI Mini series uses 24mm equivalent FOV (83° FOV) suitable for general landscape and real estate photography. Shooting from 50-100m altitude captures approximately 100-200m horizontal range in one frame. Actual coverage varies greatly depending on drone gimbal angle and altitude. Action cameras (GoPro, DJI Osmo Action) use ultra-wide lenses (FOV 120-150°) to create dynamic footage. Recent action cameras offer "linear mode" providing FOV 90-100° footage with distortion correction.

FOV Selection Strategy for Film and Broadcasting

In film and broadcast production, FOV selection is core to storytelling. Wide FOV emphasizes space and background to convey environmental importance, while narrow FOV focuses on characters and emotions. Hollywood films traditionally use 35mm, 50mm, and 85mm as standards. 35mm suits "master shots" or "two shots", 50mm is ideal for "medium shots", and 85mm is used for "close-ups" and "insert shots", delicately expressing facial expressions and emotions. For cinematic feel, consider anamorphic lenses which create 2.39:1 widescreen aspect ratios with unique flare and bokeh.