The barrel caliber is more intuitive, with optical upgrades and dual use.
The world of high definition is big.
Give kids good hobbies, cannon telescopes. Put your child ahead of the starting line.
Upgrading large caliber and upgrading optical system, the effect is improved by more than 50%.
High-definition eyepiece focusing, equipped with three types of eyepieces equipped with eyepiece groups, and the knobs on both sides can adjust the focal length.