YCT-0842 hollow straight telescope has a simple and generous lens body, and the hollow design saves space, making the telescope more lightweight and portable. The black rubber lens body is designed with human anti-skid design, and feels comfortable. With all-optical glass lens and roof prism, the imaging is clear, the field of vision is wide, and the observation details at 10 times the moderate magnification are clearer. This adopts the central focusing method to adjust the focal length, which is more convenient for focusing.