Is the Nikon PROSTAFF P3 binocular worth it for birding and hiking?

Here's the mechanism worth understanding. A binocular is really just a light bucket: the bigger the front lens, the more light it pulls in before it reaches your eye, which is what a 42mm objective buys you over the small compacts sold at gift shops. But collecting light is only half the trick. Roof prisms lose some of that light to internal reflection unless the mirror surface is coated, so Nikon runs a silver-alloy layer across the prism itself, which is what keeps colors looking like colors instead of washing out gray as the sun drops. Add multilayer coatings on the lens elements to cut glare, and the practical effect is extra usable daylight at each end of the day, exactly when wildlife tends to move. The wide field of view means you're not hunting for the bird you already lost while fiddling with focus, and the long eye relief means glasses wearers get the full image instead of a tunnel view. Nitrogen purging and sealed housing just mean none of that engineering fogs up on the first cold morning you take it out.