Calibrating Your Sky-Watcher Telescope: Tips for Sharp Viewing

Owning a Sky-Watcher telescope opens up a world of celestial wonders, but to truly appreciate the beauty of the night sky, precise calibration is key. Calibrating your telescope ensures sharp, clear views of planets, stars, and deep-sky objects. In this guide, we’ll walk you through the essential steps and tips for calibrating your Sky-Watcher telescope to achieve the best possible viewing experience.

Aligning the Finderscope

The first step in calibrating your Sky-Watcher telescope is aligning the finderscope. The finderscope is a small, secondary telescope mounted on your main telescope and is used for initial object location. To align it:

Choose a Distant Object: Select a distant terrestrial object during the daytime, like a tree or a building.

Center the Object: Using the main telescope, center the chosen object in your field of view.

Align the Finderscope: Without moving the main telescope, adjust the finderscope’s alignment screws to center the same object within the finderscope’s crosshairs.

Fine-Tune: Make slight adjustments until the object remains centered in both the main telescope and the finderscope.

By properly aligning the finderscope, you’ll have a much easier time locating celestial objects in the night sky.

Polar Alignment for Equatorial Mounts

If your Sky-Watcher telescope is equipped with an equatorial mount, polar alignment is crucial for accurate tracking of celestial objects. This process is essential for long-exposure astrophotography and tracking objects as they move across the night sky. To polar align your telescope:

Find Polaris: Locate the North Star, Polaris, in the night sky. This star is close to the celestial North Pole and is used as a reference point.

Level the Mount: Ensure your mount is level. Use a bubble level to check this.

Align with Polaris: Adjust the equatorial mount’s altitude and azimuth adjustments to point the telescope’s polar axis toward Polaris.

Fine-Tune: Look through the polar scope (if your telescope has one) and make slight adjustments until Polaris remains centered in the reticle.

Use a Polar Alignment Tool: Alternatively, you can use a polar alignment tool or app for more precise alignment.

Proper polar alignment is especially important for capturing sharp images in astrophotography.


Collimation is the process of aligning the optical components of your telescope to ensure that they are properly centered and aligned. This is particularly important for reflector telescopes, which can lose collimation over time. To collimate your Sky-Watcher telescope:

Use a Collimation Tool: Invest in a collimation tool, which can help you adjust the primary and secondary mirrors.

Center the Eyepiece: Insert the collimation tool into the focuser and center the tool’s crosshairs in the eyepiece.

Adjust the Mirrors: Make adjustments to the primary and secondary mirrors by following the instructions provided with your collimation tool.

Check the Collimation: After making adjustments, double-check the collimation by looking at a bright star. It should appear as a tight, symmetrical point of light.

Regular collimation is essential for maintaining the optical quality of your telescope.

Focusing and Eyepiece Selection

Proper focusing and selecting the right eyepiece are key to sharp viewing. To focus your Sky-Watcher telescope:

Select an Eyepiece: Choose an eyepiece with an appropriate focal length for your target.

Turn the Focus Knob: Slowly turn the focus knob while observing your target. Stop when the object appears sharpest.

Use a Focusing Mask: Focusing masks, available as accessories, can help achieve precise focus by creating a diffraction pattern around bright stars.

Calibrating your Sky-Watcher telescope may require some patience and practice, but the rewards are well worth the effort. Sharp and clear views of the night sky make for a more enjoyable and rewarding stargazing experience. Whether you’re a seasoned astronomer or just starting, these calibration tips will help you get the most out of your Sky-Watcher telescope. Happy stargazing! Contact us for more information on Skywatcher Evostar 130 and Skywatcher Heritage 130.