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Message: <blockquote data-quote="Troubador" data-source="post: 3567972" data-attributes="member: 109211">I think you have to prove you are crackers before you get accepted onto Bird Forum, so since we are both here, that probably means we passed the test with distinction.We do live on a spherical world Binny but at 1,000 metres (or yds) I think we can agree that for this purpose the earth may as well be flat.With your head in the heavens I can understand why degrees of field are your measurement of choice but for me, stuck down here on the ground, I like to have a field of view measurement at 1,000 metres because this is, in effect, the diameter of the FOV at that distance and I can get my head around it. I find that easier to visualise the view encompassed by the binos. Probably I could learn to grasp degrees of FOV too but since most of my viewing is done at less than 1,ooo metres I am not sure this would add anything.Lee</blockquote>