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dries1, do you think that "Field of view equals the objective diameter in millimeters divided by the magnification" is helpful in figuring out what the field of view of a binocular might be - especially the most popular formats such as 8x32/30, 8x42/40, 10x42/40, 10x32/30? If yes, why so...

Thanks for confirming that your 8x32 SE's field of view is - as expected - far closer to Nikon's spec of 7.5 degrees than the 4 degrees that your "Field of view equals the objective diameter in millimeters divided by the magnification" says it should be. You have stated: Well, the difference...

You plainly stated, in so many words, in your post #8 that: Since you have a collimator, please check the field of view of your 8x32 SE, empirically, and let us know whether it's 7.5 degrees, as stated by Nikon, or 4 degrees, as your "Field of view equals the objective diameter in millimeters...

By the math you presented above, field of view of an 8x32 would be 4 degrees, and an 8x30 3.75 degrees. :cat: Maybe you should write Nikon and ask how it is that they state the field of view of the 8x32 SE you owned is 7.5 degrees, when "the math behind the observation that has ruled the...