150 mm Aperture is the single most significant factor determining the performance of a telescope. The bigger the aperture, the more light your scope gathers and the higher resolution (ability to see fine detail) it has. It is powerful with ample optical performance to impress the users. This telescope incorporates fully coated glass optics with high transmission coatings for enhanced image brightness, contrast and clarity. It has Equatorial mount with setting circles which help you to accurately locate and track sky objects. The rugged tripod with steel legs delivers a rigid and stable platform.