SKY ROVER 155 APO PRO adopts triplet elements, air-spaced apochromatic, including a piece of Super ED. It is with three tube rings, the two supports telescope body, the third one is with balance and moving function; There are two dovetail plates meet LOSMANDY&VIXEN standard; CAA is a new design, 3.7" can ensure the steady of frame. It is with detachable extension tube at the end to convenient for connecting binoviewer.