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Consider a telescope with an objective diameter of 50mm and max magnification of 40x. The length of this device is about 1.5 to 2 feet. A camcorder is just about 0.5 feet and has an objective of about 25mm. How is 40x magnification achieved in it?
What kind of leather makes the most durable leather belt? Split grain, top grain, sewn, fused along the sides, reversible? Some wear out so fast and some last for years.