how can I determine the Field of View a street view panorama map is using

Question

I notice the Field of View (FOV) degree per street view zoom level is different between browsers

I believe the documented street view zoom level to FOV is

0: 180, 1: 90, 2: 45, 3: 22.5, 4: 11:25

I am using the v3 Maps API with street view panorama and get zoom levels to FOV in chrome around

0: 127, 1: 90, 2: 53, 3: 28, 4: 14

These zoom to FOV are the same in IE7 and IE8

in Firefox and IE6 they are:

0: 180, 1: 90, 2: 45, 3: 22.5, 4: 11:25 

• Is this documented?
• How can I enforce the street view FOV consistently across browsers or calculate the FOV value for that zoom level?

Answer 1

Currently, there is a table here relating zoom and FOV that says:

0=>180 1=>90 2=>45 3=>22.5 4=>11.5

You can convert from zoom to FOV in javascript like this:

var fov = 180 / Math.pow(2,zoom);