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eye relief is how close/comfortable to look thru the eyepiece, bigger number the better - ie 6m eye relief is very tight and your eye will be pressed up against the piece, 20mm is comfortable and your eye doesn't have to be glued to it
fov is field of view - or how much the eye piece lets you see out - bigger is better, think about looking thru a peephole in a plane compared with a porthole - the porthole lets you take a lot more in
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