The aparent field of view (afov) is : magnification x Field of view.
So does it mean that for your eyes looking throughout a 8x bino with a FOV of 8° give the same "windows size" feeling that using a 10x bino with a Fov of 6.4° ?
In reality what one will see will be larger in the 10x with a 6.4º actual field than it will be in the 8x but one will also see a field of view covering a smaller area than one would see when using an 8x with an 8º actual FOV.
Bob
I don't really give AFOV a thought.
Bob
Let us put aside the "feeling" of what we are seeing for a moment which seems to me to be what AFOV is about.
Does AFOV mean that one will see a FOV covering more area with a 10x with a 6.4º actual field than one will see using an 8x with an 8º actual field? Because that doesn't make sense.
In reality what one will see will be larger in the 10x with a 6.4º actual field than it will be in the 8x but one will also see a field of view covering a smaller area than one would see when using an 8x with an 8º actual FOV.
That is how I understand it and it is also how I see things when looking through binoculars. I don't really give AFOV a thought.
Bob
...I took it that AFOV expressed the relative size of the actual window, taking into account both magnification x Field of view, and was surprised to learn that it was an approximation...
Bob
I don't either. If you use binos predominantly for looking at landscapes I can imagine AFOV being useful for giving you an idea how b.i.g the view through the binos will seem.
If you are more interested in how much land or sea or sky will be in view through your binos then the field of view as measured at 1,000yds or 1,000metres is the most useful for me. And it is more useful still if you treat this linear dimension as the diameter of the circle of view and calculate its area using the pi*r(squared) formula. This will often reveal that what looks like an ignorable couple of metres or feet difference in linear fov makes a significant difference to the area of the field of view.
Lee
Off course....what i mean is the perceived size of the tube you are looking througouht..
Tunnel effect vs more opened view (aka "windows") effect.