iOptron AccuAlign Illuminated Dark-Field Polar Scope for SkyGuider Pro (3330-SGP)

A Dual-Hemisphere Reticle with 36' to 70' Alignment Circles

The core of the AccuAlign scope is its precision-engraved reticle, designed for polar alignment in either hemisphere. The dial is marked for 12 hours with 10-minute ticks, so you can place the pole star at the position given for your location and time. For observers in the Northern Hemisphere, a set of concentric circles from 36' to 44' arcminutes helps you place Polaris perfectly, while a second set from 60' to 70' is included for aligning on Sigma Octantis in the Southern Hemisphere.

Mount-Integrated Adjustable Red LED Illumination

The dark-field reticle is lit by a red LED. You set its brightness from the SkyGuider Pro itself with the Function Button and arrow buttons, or from the Set Eyepiece Light menu of the optional 8408 hand controller, so the dial is as bright as you need for your eyes and sky.

A 6° Field for App-Assisted Polar Alignment

With a generous 6-degree field of view, the AccuAlign scope helps you find the pole star. For Quick Polar Alignment you use a smartphone app, like iOptron's Polar Scope utility, to determine the exact current position of Polaris. You then simply look through the focused eyepiece and use the mount's altitude and azimuth adjustment knobs to move Polaris to the corresponding position on the reticle. For a rough alignment you can simply put Polaris at the cross hairs; the misalignment is then about 40 arcminutes.

AccuAlign #3330-SGP vs. iPolar: Optical vs. Electronic Alignment

The SkyGuider Pro comes in two versions: #3550 with this AccuAlign polar scope, and #3550A with the iPolar electronic polar scope.

• iOptron iPolar: An electronic polar scope that connects to a computer over USB and is used with iOptron's software.
• AccuAlign #3330-SGP: Used by eye with the engraved reticle, together with the iOptron Polar Scope app or the 8408 hand controller to find the pole star position. No computer is needed.