Field technique
Field of view
The width of the scene seen through binoculars, given in metres at 1,000 m or in degrees.
Try a bird, a place or a month: "hornbill", "Costa Rica", "shorebirds".
Try a bird, a place or a month: "hornbill", "Costa Rica", "shorebirds".
Field technique
The width of the scene seen through binoculars, given in metres at 1,000 m or in degrees.