Article: Specialized Optics For Special Uses. (Eagle Eyes).

There aren't many things more tiring than staring for a couple of hours through a pair of binoculars or a spotting scope. But that is exactly what varmint hunters do. So do special law-enforcement and military units that must keep a distant suspect or target under surveillance. Binoculars are commonly used for this type of work, but their weight limits useful magnification. It's just simply too hard to hold them steady.

Early Experiments

Quite a few years ago, serious varmint hunters began to rig up two spotting scopes to form a pair of more powerful binoculars. There's a lot more to that than just gluing two parts together -- but when it was done ...

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