Celestial telescope for 31.7mm 径接 eye lens.If you handiness than traditional feature ◆ pop-up of NPL series (twist up) in the mouth look, visibility wears up ※ glasses, please use it in low state (twist up) the mouth see pop-up ◆ consists of four pieces of Purozeru type 2 group. Chromatic aberration is corrected well-balanced image surface is flat, realization / ■ Specifications ■ Size cheap nuclear also purchased while high-performance eyepiece ◆ Fully multi-coated adoption to Tie a sharp image: to meet degree 50: sight apparent 31.7mm relief: 2.3mm Weight: 70g