FPV Goggles Screen FOV Comparing Tool

We all know bigger FOV gives you “bigger screens”, but how much bigger? In this short post we are going to find out. I also made a handy tool to let you quickly compare the FOV between two sets of goggles side by side. It’s scary what a strong cup of coffee can do to you :D

FPV Goggles FOV Comparison Tool

Check out the tool here :) https://oscarliang.com/js/fpvgogglefov.html

The following explains how the tool works.

What does FOV mean to FPV Goggles?

FOV stands for field of view. The spec provided by FPV Goggles manufacturers usually includes diagonal FOV, which is the distance between the two diagonal corners of the projected image.

In order to compare different goggles, we need to know the relative projected image size, which we can work out from FOV and aspect ratio.

Here are the steps and formulae that solve the problem. Feel free to look at the Javascript codes too to see how it’s implemented.

It’s hard to visualize what sort of image size we are dealing with when only talking about FOV. I think this tool is really powerful in giving people a better understanding of how FOV affects image size.

One interesting thing i notice is how much smaller 16:9 appears compared to 4:3 even when they have similar FOV :)

Conclusion – FOV is NOT Everything

There has to be a minimum FOV a goggle should have in order for us to see the image clearly. For me it’s 30 degrees.

Some people prefer larger FOV because it’s more immersive. However some prefer smaller FOV because they don’t need to move their eyes as much to see the OSD, and it’s less likely to have blurry edges.

Bigger isn’t always better, It’s just a personal preference.

And there are so many other factors that go into selecting the ideal FPV goggles. Make sure to check out my FPV Goggle Buyer’s guide to learn more.

Let me know if you have any comments or questions about this.

11 thoughts on “FPV Goggles Screen FOV Comparing Tool

  1. Pangit

    Great tool, would love it if you could also include some older goggles e.g. the Attitude V2s (640×480 35deg FOV) and V3 (640×480 32deg FOV)

    Reply
    1. Oscar Post author

      okay I will work on that once i have time :) but there are other goggles with the same FOV you can use to compare :)

      Reply
  2. Dafunk

    My conclusion : 16/9 is such a non sense on FPV goggles.
    16/9 makes sense on TV screen and box fpv because we have 2 eyes and the full picture we see with both eyes has a rectangular form.

    My thoughts :
    Let’s assume each eye can see a square (in fact it sees a circle). putting two squares horizontally next to each other result into a rectangle hence the concept of 16/9 is valid.
    when it comes to fpv goggles, each eye is looking at a separate screen but each screen is showing the exact same picture.
    As long as both screens show the exact same picture, the optimal ratio is a square (or a circle)

    Let’s assume we are looking at a painting showing the letters ABCD.
    To make 16/9 useful, the left screen should show ABC
    the right screen should show BCD
    Meaning both screen display BC corresponding to the middle of the painting
    only the left eye can see the A, only the right eye can see the D and both eyes can see BC

    Reply
    1. BurninCoco

      I have domintor v2, dominator hd v2, both square and both I hate equally. Maybe I hate the hd v2 more. My wife had the dominator v3 which are 16:9 and I love them so much I bought the flysight FG01 which are also 16:9 and I just fell in love with flying once again. Some cameras aI use are the new micro eagle and micro swift wich are also 16:9 but even flying my old hs1117s everything looks better.
      I have a masters in cinematography so you can imagine how I was with all that “the aspect ratio has to be perfect!” It turns out it’s the opposite of what you think.
      Please give it a try by actually flying different goggles and make up your mind. Maybe you’ll still think the same and that’s all right, but you tried it.

      Reply
  3. Chad

    How about Fatshark Transformer’s with Binocular viewer?

    I know people don’t love the form-factor but the 55° FOV is well worth it.

    Would be a fun comparison (especially to my old Predators, 25°)

    Reply
  4. Strepto

    This is a worthwhile and useful tool but I couldn’t agree more with your conclusion. I went from HD2 to a set of prototype HDOs back in January. Looking at the tool, the difference seems massive! But when switching goggles it seemed like a much smaller change and didn’t bother me at all. The quality of the image was so much better that any loss of FOV more than made up for it in terms of visible detail as well.

    At the end of the day goggles are such personal things, so try as many as you can before buying. Get the ones you like the most, that you can afford. Happy flying!

    Reply
  5. Pablo

    Very interesting the comparison tool!
    Is it possible to add some box tipe Googles (eachine vrd2 for example) to compare with fatsharks, aomways etc…??
    Thanks

    Reply
  6. Quad Jockey

    Im trying to work out what to buy and this is a great help. I’d also like to see some other metrics to compare goggles with different aspect ratios. The horizontal and vertical FOVs. Also the virtical and horizontal resolutions in pixels for degree of hor/virt FOV.

    Reply

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