I don't know a huge amount this but after a vague interest in Target shooting a while ago I picked up some awareness. I take it you know the basics - the first number is usually the magnification eg 7x or 10x for sporting binoculars. The second number is the diameter in mm of the object lense - the big end. The bigger the better generally but if the optics are very high quality then they can be smaller. If you divide the big number by the small number this gives you a guide as to how easy they will be to use in practice. An outcome greater than 5 is Good; less than 4 is pretty crap. If you go for high magnification you really do need big lenses or get something fancy with image stabilisation.
Having said all that optics really do make or break a scope. I have a pair of very fancy pair of Swarovski bino's. They are 7x42 and the image is awesome giving the impression of much greater magnification compared to much cheaper pair of 10x50 I also have.
I also used to have an ex-naval pair of 10x60. These are the sort you see salty sea dogs using in films. Average optics and age spoilt them, then I dropped and broke then, but something like this would be ideal for you although they are heavy. Good luck and dont turn into a Pervy voyeur.



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