Hi,

I'm curious as to how the focal ratio for a binocular would be calculated for a given true FOV (not apparent FOV)?

For instance, if I wanted a binocular that would provide a fixed magnification at 30x and provide a FOV of 3 degrees, what would my focal ratio have to be and what role would the eyepieces play in this calculation?

Thanks,

Eric

I'm curious as to how the focal ratio for a binocular would be calculated for a given true FOV (not apparent FOV)?

For instance, if I wanted a binocular that would provide a fixed magnification at 30x and provide a FOV of 3 degrees, what would my focal ratio have to be and what role would the eyepieces play in this calculation?

Thanks,

Eric