It seems to be instinctive for most people to hold Porro prism binoculars around the prism housings (Figure 6.1). The weight of the binocular is taken entirely by the arms, and the upper arms are extended forward. Although this initially feels comfortable, it is inherently tiring and unstable, especially when you are observing objects at high altitude. It rapidly results in fatigue, which, even after a few minutes, is easily noticeable, both in the limbs themselves and in the amount you can see. It is very easy to improve upon this, merely by moving your hands an inch or so closer to your face to form the triangular arm brace.
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