Could someone please explain the simplest way to accurately measure a binoculars field of view.
Can the fov be measured and marked on a wall at 10 yards and then just multiply that figure times 100 to determine the 1000yd fov ?
thank you
One accurate way is to point the binoculars up at the night sky (on a clear night...) and place two stars at opposite edges of the field. Ideally you'll want to put the binoculars on a tripod, if possible. This method is for the astronomically inclined. The hard part is identifying those two stars on a star chart and measuring, on the chart, the angular distance between the two. If you can do that, then you have the true field in degrees. Multiply that figure times approx. 52.5 and you get the field in feet at 1000 yards.
Hint: the distance between the Big Dipper's pointer stars is about 5 degrees.
Thank you for the interesting method.....
but I am not "astronomically inclined".
Can anyone suggest a more 'down to earth' method?