The principle consists of two convex lenses. Because there is a real image between the two, the reticle can be easily installed, and the various performances are excellent, so military telescopes, small astronomical telescopes and other professional telescopes adopt this structure. But this kind of structure imaging is inverted, so it is necessary to add a positive imaging system in the middle. The erect image system is divided into two categories: prism erect image system and lens erect image system. Our common typical binoculars with a wide front and a narrow rear both use a double right-angle prism mirror orthographic system. The advantage of this system is that the optical axis is folded twice while the image is being erected, thereby greatly reducing the volume and weight of the telescope. The lens erecting system uses a complex set of lenses to invert the image, and the cost is relatively high, but the Russian 20×50 three-section telescopic classic monoculars both use a well-designed lens erecting system.
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