VIOFO Horizontal FOV Database

[Forester25]

Yes your set up is very nice. I like seeing this type of work with the math involved.

 

[Nigel]

That was a real job making that chart your 45 degree mark needs to be 20.71 cm from the center. And the 90 degree mark at 50 cm from center. But each progressive degree mark must be ever so slightly more distance than the one before. Great job.

You missed the fact that his scale is in cm (even though it is in the USA!), so it was easy to print and easy to understand.
The conversion from cm to degrees requires a simple bit of trigonometry, which does need to be done for every reading, but would be really easy if using a spreadsheet...

A119M Pro
112.26° FOV

That is a nice figure for a 4K dashcam, big improvement over the rather extreme A119 Mini 2 🙂

 

[Forester25]

Nigel,
The trig formulas do not care what the input is as long as you don’t switch gears in the middle. Miles, Meters, Yards, Centimeters, or inches trig can give length of sides and degree of angles as long as a few measurements are given as the formula needs to complete the answer. His scale could just as well have been in inches and then using the same trig formula to give degrees, With the help of the internet it is easy just time consuming to cover that big of scale.

 

[Nigel]

as long as you don’t switch gears in the middle

That is probably why our images are captured by lenses measured in metric focal lengths, and when the image emerges on a monitor, our screens are measured in inches!

 

[Forester25]

Nigel,
OK, You got me.👍

 

[Chuck McCoy]

his scale

His scale

You guys keep saying “his scale”.
There is no scale.
All I’ve done is put a “yardstick” on the wall.
The only thing I can screw up with human error is failing to place the camera lens in the exact same location for every measurement.
That’s why I built that wooden jig.
The jig allows me to place the camera lens exactly 50cm from the “yardstick” and also the same height with 100% reliable repeatability.
It’s explained in post #1, but I can see why no one would go back, and read that. HERE IS POST #1
Also, I can’t take credit for any of this.
It was the guys mentioned in post #1 that gave me the instructions to make this set up.
I barely graduated high school.
The highest math I passed was 8th grade pre-algebra.
I’m barely qualified to push = on a calculator. lol

 

[Nigel]

All I’ve done is put a “yardstick” on the wall.

You know that it is actually a meterstick 😉

You might not be qualified to use a meterstick, but many would have failed to print the meterstick at the correct scale. What you have works, and that is what matters 😎

 

[Chuck McCoy]

You know that it is actually a meterstick 😉

When I say the word “meterstick” it makes me feel less patriotic as an American.
However, I love my 7.62x51mm ❤️

 

[Chuck McCoy]

A119M Pro (received 4/8/26)
112° FOV