Starlight Xpress Lodestar X2 Autoguider Only 1.25 inches in diameter allows it to drop neatly into your 1.25-inch eyepiece holder - no additional adaptors required. Large Imaging Area (6.45mm x 4.75mm) giving you a wide field of view to find a suitable guide star. Sensitivity - with an impressive 77% QE, and large pixels, the Lodestar X2 just sucks up those photons. Sensitivity is key, but combined with the incredibly low noise of the Lodestar X2, finding a guide star has just become even easier. Full size RJ12 Autoguider Port - No need to run extra cables from your computer to control your mount corrections. Powered by the USB of your computer so no need to carry an extra power supply with you - one less thing to forget when you are on your way to the Star Party.