A Step-by-Step Guide on Collimating a Bird Jones Telescope

Let me walk you through a step-by-step guide on how to collimate a Bird Jones telescope. If you’re an astronomy enthusiast like me, you know the importance of having a properly aligned telescope for clear and crisp views of the night sky. Collimating a Bird Jones telescope, with its unique design and additional lens, can be a bit tricky, but fear not! I’ve got you covered with this comprehensive guide that will have your telescope perfectly aligned in no time. So grab your telescope and let’s get started on this exciting journey of discovery!

Step 1: Understanding Collimation

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What is Collimation?

Collimation is the process of aligning the optical components of a telescope to ensure the best possible image quality. It involves adjusting the mirrors in the telescope to correct any misalignments or distortions.

Why is Collimation Important?

Proper collimation is crucial for obtaining sharp and clear images through a telescope. If the optical components are misaligned, the image quality will be compromised, resulting in blurry or distorted views of celestial objects. Collimation is especially important for Bird Jones telescopes, which tend to require more frequent adjustments due to their design.

Collimation Tools

To collimate a telescope, you will need a few essential tools. These include a collimation eyepiece, a screwdriver or Allen wrench for adjusting the mirrors, and a soft brush or compressed air for cleaning the optical surfaces. Additionally, a stable tripod or mount is necessary to ensure stability during the collimation process.

Step 2: Preparing for Collimation

Gather the Required Tools

Before starting the collimation process, gather all the necessary tools mentioned above. Having them readily available will make the process smoother and more efficient.

Choose a Suitable Location

Selecting the right location is crucial for collimation. Ideally, choose a well-lit area with a clear view of the sky. Avoid places with bright lights or obstructions that could interfere with the collimation process. Calm and stable weather conditions also contribute to better collimation results.

Check the Telescope’s Condition

Before beginning the collimation process, inspect your telescope for any visible damages or loose components. Ensure that all screws and knobs are securely tightened, and check for any signs of wear or tear. It’s essential to address any issues before proceeding with collimation to avoid further damage to the telescope.

Step 3: Assess the Telescope

Inspect the Optical Components

Carefully examine the primary and secondary mirrors of your telescope for any dust, fingerprints, or smudges. These can affect the image quality and should be cleaned before collimation. Use a soft brush or compressed air to gently remove any debris from the optical surfaces.

Identify Misalignments

Look for any obvious misalignments in the mirrors. For example, if the secondary mirror is noticeably tilted or off-center, it will need adjustment. Similarly, if the primary mirror appears misaligned, it must be rectified during the collimation process.

Check for Damages

Inspect the telescope’s optical tube assembly for any damages or deformities. Look for dents, scratches, or signs of corrosion. Damaged components can affect the collimation process and may require professional assistance for repair.

Step 4: Aligning the Secondary Mirror

Removing the Dust Cap

Start by removing the dust cap from the front of the telescope. This will expose the secondary mirror and allow you to access the adjustment screws.

Locate the Secondary Mirror Adjustment Screws

Look for the three adjustment screws around the secondary mirror. These screws control the tilting and centering of the mirror. Familiarize yourself with their locations before proceeding.

Aligning the Secondary Mirror

Using the collimation eyepiece, adjust the three screws to align the secondary mirror. The goal is to ensure that the reflection of the primary mirror is centered and perfectly concentric within the secondary mirror. Make small adjustments, checking the alignment frequently, until the desired result is achieved.

Step 5: Aligning the Primary Mirror

Finding a Suitable Collimation Tool

Choose a suitable tool to help align the primary mirror. Generally, a collimation cap or a laser collimator is used for this purpose. Follow the instructions provided with the tool to set it up correctly.

Locate the Primary Mirror Adjustment Screws

Identify the primary mirror adjustment screws, usually located at the back of the telescope. These screws control the tilting of the primary mirror.

Performing Primary Mirror Collimation

With the collimation tool in place, adjust the primary mirror’s tilt by turning the appropriate screws. The goal is to align the mirror so that the collimation tool’s target is at the center of the mirror. Make small adjustments and check the alignment repeatedly until the primary mirror is properly collimated.

Step 6: Checking for Proper Alignment

Using a Collimation Eyepiece

After aligning both the secondary and primary mirrors, insert the collimation eyepiece in the telescope’s focuser. This eyepiece allows you to evaluate the collimation accuracy and make any necessary fine-tuning adjustments.

Evaluating the Image Quality

Look through the collimation eyepiece and observe the image quality. The image should appear sharp and well-defined. Pay attention to any signs of distortion, such as unevenly shaped stars or blurry details. If the image does not meet your expectations, further adjustments are required.

Fine-Tuning if Necessary

If the image quality is not optimal, use the adjustment screws to make fine-tuning adjustments. Make small changes and observe the effect on the image quality. Repeat this process until you achieve the desired collimation and optimal image sharpness.

Step 7: Cleaning and Reassembling

Cleaning the Optical Surfaces

Before reassembling the telescope, clean the optical surfaces with a soft brush or compressed air. Remove any dust or debris that may have accumulated during the collimation process. Take care not to touch the mirrors with your fingers as this can leave fingerprints.

Reassembling the Telescope

Carefully reattach any components that were removed or loosened during the collimation process. Make sure all screws and knobs are securely tightened but avoid over-tightening, as this can cause damage to the telescope.

Performing a Final Alignment Check

Once the telescope is reassembled, perform a final alignment check using the collimation eyepiece. Ensure that the primary and secondary mirrors are still properly aligned and that the image quality remains sharp and clear. Minor adjustments may be necessary at this stage to achieve perfect collimation.

Step 8: Understanding Common Issues


Astigmatism is a common issue in telescopes that can result from misaligned or deformed optical components. It causes distorted star shapes, making them appear elongated or oval. Proper collimation helps minimize astigmatism and improve overall image quality.

Spherical Aberration

Spherical aberration occurs when light rays passing through the outer parts of a mirror focus at different distances than those passing through the center. It leads to a loss of sharpness and contrast in the image. Collimation can help reduce spherical aberration by aligning the mirrors.


Coma is an optical aberration that causes the outer parts of an image to appear distorted, resembling a comet’s tail. It often occurs when the primary mirror is misaligned. Collimation can help correct coma and produce images with sharper and more accurate details.

Step 9: Troubleshooting Tips

Blurry Images

If your telescope produces consistently blurry images even after collimation, there may be other factors at play. Check the telescope’s focus and ensure that it is correctly adjusted. Additionally, atmospheric conditions like turbulence can also cause image blurring.

Double Images

Double images can indicate a problem with the telescope’s alignment or collimation. Make sure both the secondary and primary mirrors are correctly aligned. If the issue persists, professional assistance may be required to diagnose and fix the problem.

Loss of Contrast

Loss of contrast in the images may be caused by various factors, including poor collimation. Ensure that the mirrors are properly aligned and clean. Additionally, consider the effect of light pollution and adjust your observing location if necessary to improve contrast.

Step 10: Maintenance and Regular Collimation

Routine Maintenance

Regular maintenance is essential for keeping your telescope in optimal condition. Clean the optical surfaces regularly and inspect for any signs of wear or damage. Regularly check the collimation of your telescope to ensure the best possible image quality.

When to Recollimate

In general, it is a good practice to perform collimation after any transportation or significant changes in temperature or humidity. Additionally, if you notice a drop in image quality or suspect misalignments, it is advisable to conduct a collimation check.

Tips for Ensuring Long-Term Alignment

To maintain long-term alignment, handle your telescope with care, avoiding rough handling or impacts. Store it in a safe and stable environment, protecting it from dust and humidity. Regularly check the collimation and make minor adjustments if necessary to prolong the accuracy of your telescope’s alignment.

In conclusion, collimating a Bird Jones telescope involves a systematic process of aligning the optical components to ensure optimal image quality. By following the step-by-step guide above and understanding common issues and troubleshooting tips, you will be able to enjoy clear and sharp views of the night sky with your collimated telescope. Remember to perform regular maintenance and collimation checks to keep your telescope in excellent condition for years to come.





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