Jump to content

Sign in to follow this  
pilotjohn

Zoom level to FOV conversion?

Recommended Posts

Does anyone know how the zoom level (e.g. 40% 50%) in the settings correspond to the field of view (FOV) in the default pilot position, or what the formula is? I believe 1.0 zoom level in FSX was 34 degrees vertically (with wide screen true), or horizontally (with wider screen false). Is it the same in MSFS? 34 degrees horizontally by default, which would make the default 50% zoom level equal 68 degree FOV?

Share this post


Link to post
Share on other sites

I haven’t found any FOV settings and the default zoom for me doesn’t zoom in near enough, not useful for spotting airports in the distance etc 


Thomas Derbyshire

Share this post


Link to post
Share on other sites

I made an experiment with the C172 at the sunset. The difference in two headings, when the sun is at the left and at the right edge of the screen/view respectively, is the field of view (FOV). For the screen ratio of 3840x2160 (4k) and the zoom of 50%, the FOV is 100 degrees. This works quite fine with the eyes about 75cm from the 48" screen.

Edited by Mark1616

Share this post


Link to post
Share on other sites
10 hours ago, Mark1616 said:

I made an experiment with the C172 at the sunset. The difference in two headings, when the sun is at the left and at the right edge of the screen/view respectively, is the field of view (FOV). For the screen ratio of 3840x2160 (4k) and the zoom of 50%, the FOV is 100 degrees. This works quite fine with the eyes about 75cm from the 48" screen.

Did you use the cockpit view or external view for this?

Notice that the "zoom" is not the same for different cameras (thread).

Share this post


Link to post
Share on other sites
10 hours ago, Mark1616 said:

I made an experiment with the C172 at the sunset. The difference in two headings, when the sun is at the left and at the right edge of the screen/view respectively, is the field of view (FOV). For the screen ratio of 3840x2160 (4k) and the zoom of 50%, the FOV is 100 degrees. This works quite fine with the eyes about 75cm from the 48" screen.

So you're 30" from a 48" screen (which about 42" wide). This is a FOV of atan(21/30)*2 = 70 degrees IRL. The best immersion for the sim would be if you were to match this with zoom. I'm in a similar state, 32 inches from a 55" screen, and a high FOV in game doesn't feel right (compared to when I sit in the cockpit in real life). I've tried to match the sensation, and I've also done some empirical testing.

My testing involved slewing the aircraft to altitude, pitched down above a runway (swapping between slew and active pause in cockpit since the zoom factor between cameras differ), to see at what altitude I can see both ends of the runway (side to side). At KORS, which is about a 3400 foot runway, with a zoom of 55, I had to be at 2200 feet. This is about atan(1700/2200)*2 = 75 degrees of field of view.

  • Like 1

Share this post


Link to post
Share on other sites
11 hours ago, Mark1616 said:

I made an experiment with the C172 at the sunset. The difference in two headings, when the sun is at the left and at the right edge of the screen/view respectively, is the field of view (FOV). For the screen ratio of 3840x2160 (4k) and the zoom of 50%, the FOV is 100 degrees. This works quite fine with the eyes about 75cm from the 48" screen.

I also just tried your method, and 55 zoom is roughly 75 degrees in cockpit (but not in Slew mode - you have to slew, active pause, switch to cockpit, rinse, repeat). So our two methods agree.

  • Like 1

Share this post


Link to post
Share on other sites
7 hours ago, pilotjohn said:

Did you use the cockpit view or external view for this?

Notice that the "zoom" is not the same for different cameras (thread).

It was in a cockpit view. Your method with the runway length is pretty smart (of course if length as a physical concept is properly implemented in MSFS ...).

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    39%
    $9,885.00 of $25,000.00 Donate Now
×
×
  • Create New...