I needed a compact field binocular for investigative purposes. I take this in my car to go check up on distant objects, hence I required something compact but not too expensive in case it gets ripped off. I also required something that has good eye relief because I don't want to take my glasses off (this includes sun glasses) each time I peer through. In case you're not familiar with binocular design, eye relief specs are extremely important because poor eye relief will leave you seeing almost nothing so you'll be forced to take off your glasses. Well, the eye relief is "very good". Could be a notch higher into "excellent" but you'll end up paying much more $ if you want that. Overall optics are excellent. I love these things, and like I mentioned these aren't too expensive so no need to have a heart attack in case they get lost/stolen.