Specification: 4x 30

magnification: 4X,

material: glass lens high definition

objective lens diameter: 30mm

product Size: 11.2*4 * 9CM

packing quantity: 100pcs/carton

box gauge: 45*41 * 41CM

gross weight: 18/17KG

packing: soft bag, glasses wiping cloth, hang rope

telescope is a kind utilization lens or mirrors and other optical devices to observe distant objects optics instrument. Using through lens light refraction or light quilt concave mirror the reflection makes it enter the small hole and converge to image, and then it is seen through a magnifying eyepiece. Also known" qianli mirror".

The first function of the telescope is to enlarge the opening angle of distant objects so that human eyes can see clearly. Angular distance smaller details. The second function of the telescope is to send the beam collected by the objective lens much thicker than the pupil diameter (up to 8mm) into the human eye, so that the observer can see the dark weakness that was originally invisible. Object. In 1608, Hans lieboshi, a Dutch optician, accidentally found that he could see the distance clearly with two lenses. Scenery inspired by this, he created the first telescope in human history.

After more than 400 years of development, the functions of telescopes are becoming more and more powerful, and the distance of observation is getting farther and farther. In 1609, the Italian Florentine, Galileo Galili, invented the 40-fold double-mirror telescope, which was the first practical telescope to be put into scientific application.