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A binoculars magnification and field of view (or angle of view) are connected, that is the more powerful the magnification, the narrower your field of view tends to be. So there is always a balance to be made between how much detail you want to see versus how much of the scenery you want in your view at any one time.
There are many situations where a really wide field of view (FOV) is prefferable to a powerful magnification. For example when you need to scan over a large area looking for something, so for instance if you were looking for a deer or stag on the side of hill across the valley. It also really helps when for example you see a bird and quickly lift your binoculars up to your eyes. The wider your view, the more likely that the bird will be in it immediately. A wide FOV is also important when observing small and fast moving objects like birds that never seem to stay still, especially if they are well camouflaged, like in a forest or thick vegetation. In these situations, something like an 8x binocular with a wide field of view would be a better choice than a more powerful binocular.
However as I discussed in detail in an article entitled, 10x42 Binoculars for Bird Watching, there are also quite a few situations where a more powerful magnification may be more prefferable to binocular with a really wide field of view, even when birdwatching.
For example a really wide field of view may not be that important if you are bird watching or observing wildlife or indeed almost anything else out in the open, like at the side of a lake, at the sea, on open fields or on marshes. Here the birds and other wildlife is often quite easy to locate and to follow. A wide FOV is also less important when you are observing larger, slower or predictable moving birds and animals, many water birds and raptors falling into this category as do most larger land mammals. So as you can see there are some areas, even in birding where it may not be essential to have a very wide field of view.
However this does not mean that the field of view is now not important at all and it still makes sense that if you do choose a higher magnification like 10x, to also choose a binocular in your chosen magnification with the widest angle of view (field of view) as possible. In this way you are ensuring that your binoculars are as versitile as possible, giving you plenty of detail, but also making it relitively simple to spot and follow fast moving birds or search for wildlife aver a wide area in the distance.