Double-speed rack and pinion focuser The gear ratio of the 2-inch rotatable double-speed focuser is 1:10, so that it is easy to achieve accurate focus. FMC glass lens Fully multi-layer coated lens maximizes the light transmittance and eliminates chromatic aberration. 90mm objective lens 90mm objective lens collects a large amount of light thereby providing an enhanced and brighter field of view. Simple operation Quick and easy focusing can be achieved without any tools, even novices can operate it quickly and easily. Well made The Travel Tripod Made of aluminum alloy, more durable and strong of maximum height is 64.56 inches. Easily adjust 3 sections column legs with a quick release flip-lock knob allows it to be folded to a shorter height of 27.56 inches, which can meet various shooting needs. Variable functions The convenient handle and built-in bubble level can realize the tripod translation and tilt movement, so as to meet any angle required by the user. It comes with a standard 1/4 "quick release plate, you can install and remove the camera in seconds. SV188P 1.25in dielectric diagonal compatible with any 1.25in refractor telescope. SV188P can not connect with the SCT telescope directly, the additional adapter is required if you want to connect SV188P with the SCT telescope.