You copy 90 FOV from one game into another. The number matches, but the second game looks zoomed in. Or you move a setup from a 4:3 guide to a 16:9 monitor and suddenly see far more at the sides.
The problem is not your eyes. A FOV number is incomplete unless it also says:
- which axis it measures — horizontal (HFOV) or vertical (VFOV);
- which aspect ratio the number uses as its reference;
- which camera state it describes — hip-fire, ADS, a vehicle camera, or a weapon viewmodel.
The full illustrated guide and current game-convention table are here:
Why the Same FOV Feels Different Across Games
HFOV and VFOV are different angles
HFOV measures the visible world from left to right. VFOV measures it from top to bottom. A widescreen monitor is wider than it is tall, so the two degree values cannot be equal while describing the same camera.
On a 16:9 display:
- 90° horizontal is about 58.72° vertical.
- 90° vertical is about 121.28° horizontal.
That is why copying a bare 90 between two games can create a dramatic mismatch.
Why 90 at 4:3 becomes 106.26 at 16:9
Source-style games often express horizontal FOV against a 4:3 reference, even when the player uses a widescreen display. Preserve the vertical view while moving that camera to 16:9 and the actual horizontal angle expands.
For a centered rectilinear camera with aspect ratio A:
HFOV = 2 × atan(tan(VFOV / 2) × A)
VFOV = 2 × atan(tan(HFOV / 2) / A)
Starting from 90° horizontal at 4:3:
90 H at 4:3 = 73.74 V = 106.26 H at 16:9
Do not multiply the angle by 16/9. Perspective is based on the tangent of half the angle, so linear scaling gives the wrong answer.
You can run the conversion without doing the trigonometry by hand in the free FOV calculator. Use Custom mode when transferring an exact source convention.
Why game presets still need labels
Different games expose different camera conventions:
| Game | What the number means |
|---|---|
| Counter-Strike 2 | The normal world view uses a Source-style 4:3 horizontal base; 90 becomes about 106.26 H at 16:9. |
| Valorant | The normal PC world camera is fixed at 103° horizontal on a 16:9 base. |
| Apex Legends | The 70–110 slider uses a Source-style 4:3 horizontal base. |
| Battlefield 2042 | The on-foot slider is explicitly vertical, 50–105. |
There is another trap: a weapon-viewmodel FOV can change how large the gun looks without changing how much of the world the camera shows. Two screenshots can therefore feel different while the environment framing is identical.
A reliable cross-game matching workflow
- Record the source game, slider value, resolution, aspect ratio, camera state, axis and reference ratio.
- Normalize the source value to VFOV. It is a convenient bridge when moving between aspect ratios.
- Convert that VFOV to the target game's expected convention.
- Match the same camera state — hip-fire to hip-fire, not hip-fire to ADS.
- Validate with fixed landmarks near the screen edges, not the weapon model.
- Save the result with its labels, for example
73.74 V / 106.26 H at 16:9.
The same rule applies to aim trainers: choose the correct game profile or FOV scale, resolution, aspect ratio and scoped state before copying the value.
The key idea is simple: match the projection, not the number.
For the worked examples, current game notes, diagrams and FAQ, read the complete canonical FOV guide.
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