Orion Sirius 100ED EQ-G Dual-Axis Control Refractor Telescope Kit, with Eyepiece, Tripod & Mount and Software.

The Orion Sirius 100ED EQ-G Dual-Axis Control Refractor provides pristine, high-contrast images. The ED100 delivers images remarkably free of chromatic aberration, thanks to the FPL-53 extra-low dispersion "ED" optical glass in one of the two objective lens elements. That, combined with the 900mm focal length (f/9.0), ensures that bright stars, planets and the lunar limb won't be marred by color fringing.

The 100mm aperture gives it 56% greater light grasp than theED80, letting you push the magnification higher to resolve finer details. The baffled, 36" long aluminum tube is outfitted with a 2" Crayford-style focuser (with 1.25" adapter) for exceptionally smooth focusing without backlash. The Sirius EQ-G has the stability you need to enjoy steady images at high powers. The mount's internal dual-axis stepper motors slew your telescope at up to 3.4° per second right to your target.

Other features include a CCD autoguider port for imaging, periodic error correction (PEC), latitude and azimuth adjustments for polar aligning and an illuminated polar axis scope. The tripod is remarkably sturdy, featuring extendable 1.75"-diameter stainless steel legs and a cast-metal spreader plate. It requires 12-volt DC power source such as the Orion Dynamo or AC-to-DC adapter for use of household 110V power.