How to Use an Apertura Laser Collimator

On this page (10 sections)

1. How do you use an Apertura laser collimator step by step?
2. How should the laser fit in the focuser?
3. How can you check whether the laser itself is aligned?
4. How do you center the beam on the secondary mirror?
5. How do you adjust the primary mirror?
6. What should you do if the beam won't stay centered?
7. What accessories can help protect your optics?
8. How can you tell when to stop adjusting?
9. What is the safest way to use the collimator?
10. Which steps matter most when using an Apertura laser collimator?

To use an Apertura laser collimator, seat it squarely in the focuser, center its beam on the secondary mirror's center mark, then adjust the primary mirror until the return beam reaches the target. Check that the laser itself is aligned first, and follow the instructions for your telescope model.

The basic sequence is simple, but a loose fit or misaligned laser can send you adjusting a mirror that was already close. Work slowly, use the telescope's own collimation instructions, and never look into the laser or point it toward another person.

How do you use an Apertura laser collimator step by step?

Center the outgoing beam first, then center the returning beam. This sequence aligns the secondary and primary mirrors on a Newtonian reflector.

1. Set the telescope on a stable surface and point it away from the Sun.
2. Check that the laser collimator is aligned and its battery works.
3. Insert the collimator fully into the focuser, then secure it so it sits squarely.
4. Turn on the laser and check where the beam lands on the secondary mirror.
5. Adjust the secondary screws in small turns until the outgoing beam reaches the primary mirror's center mark.
6. Adjust the primary mirror screws until the return beam meets the collimator's target.
7. Recheck both positions, since changing one mirror can affect the other.

The exact target markings and adjustment points can vary by collimator and telescope. Use the instructions supplied for your equipment if they differ from these general steps.

For a fuller overview of how to collimate a telescope, including other telescope designs, start with the steps that match your optical tube.

How should the laser fit in the focuser?

The collimator should sit fully inserted and square in the focuser. If it wobbles or shifts when secured, the beam position may change with the fit rather than with mirror alignment.

Before tightening the focuser clamp, check that the collimator's shoulder is seated evenly. Secure it with the focuser's normal tension or compression ring, without forcing the barrel or overtightening a screw.

If you can rotate or reseat the collimator and the beam position changes, pause. The focuser, adapter, collimator barrel, or clamp may be allowing a tilt; correct the fit before touching the mirrors.

A snug, repeatable fit matters more than making the clamp tight. Recheck the laser position after any change to how it sits.

How can you check whether the laser itself is aligned?

Rotate the collimator in a stable holder and watch the beam on a fixed surface. A well-aligned laser should remain on the same point as it turns.

You can use a V-block or another steady support that holds the barrel without shifting. Aim the laser at a wall several feet away, mark the beam position, and rotate the collimator slowly.

If the spot traces a circle, the laser may need adjustment, or the holder may not be keeping it square. Don't use that beam to collimate the telescope until you identify the cause.

A laser's own alignment and its use in the telescope are separate checks. This explanation of how a laser collimator works can help you understand why a drifting beam creates misleading mirror adjustments.

How do you center the beam on the secondary mirror?

Adjust the secondary mirror until the outgoing beam meets the primary mirror's center mark. Use small turns of the secondary adjustment screws and watch the beam after each change.

The center mark is usually a small ring or dot on the primary mirror. Keep your eye away from the beam path, and don't loosen the secondary's central mounting screw unless your telescope instructions call for it.

If the beam doesn't reach the primary mirror, check whether the secondary mirror is positioned and angled correctly. A laser alone may not show whether the secondary is centered under the focuser, so use the telescope's recommended sighting method when needed.

For the full reflector procedure, see how to collimate a Newtonian telescope. That guide helps when the secondary needs positioning as well as a tilt adjustment.

How do you adjust the primary mirror?

Turn the primary mirror's adjustment screws until the return beam lands on the target at the collimator. Make small changes, observe the spot, and stop when it is centered according to the equipment instructions.

The return beam travels back from the primary mirror toward the focuser. If it misses the target, adjust the primary using the knobs or screws intended for collimation, not the locking screws unless the manual directs you to use them.

Some telescopes have separate locking screws. If yours does, loosen them only as directed and retighten gently after adjustment, checking that the beam stays centered.

Don't force a screw that feels stuck, and don't assume one centered spot proves every part of the optical alignment is correct. A star test or other check recommended by the telescope maker can confirm how the telescope performs after collimation.

What should you do if the beam won't stay centered?

Stop and check the collimator fit, laser alignment, and adjustment sequence before turning more mirror screws. A changing beam position can come from a loose fit or a laser that isn't aligned.

Try these checks one at a time:

• Reseat the collimator fully and evenly in the focuser.
• Confirm the focuser clamp holds it without tilting.
• Rotate the laser in a stable holder and see whether its spot drifts.
• Recheck the secondary beam before adjusting the primary return.
• Consult the manual for the correct screws and locking procedure.

If the laser passes its rotation check but still shifts in the focuser, the fit may be the problem. If its spot circles during rotation, learn how to collimate a laser collimator before using it to adjust the telescope.

What accessories can help protect your optics?

Use a blower or lens-safe cleaning tools only when dust or smudges need attention. Collimation itself does not require cleaning products, and avoid touching mirror coatings unless cleaning is necessary and the telescope manual allows it.

The Altura Photo kit includes an air blower, brush, lens pen, cleaner, microfiber cloths, and lens tissues. Its cleaner is described as alcohol-free and ammonia-free for camera lenses and coated glass.

Do not assume camera cleaning instructions apply to a telescope's primary mirror. Follow the telescope maker's cleaning guidance, and avoid using a cloth, pen, or liquid on a mirror unless that guidance permits it.

The K&F CONCEPT kit includes a dust blower, lens cleaning pen, and microfiber cloths. Its stated uses include coated lenses and electronics, which may suit readers who also have camera or eyepiece surfaces to maintain.

Keep cleaning tools away from the exposed primary mirror during collimation. A dust blower can move loose particles, but do not blow debris toward the mirror or touch the reflective surface.

For messes around the telescope rather than on its optics, the BISSELL Little Green cleaner is designed for carpet and upholstery. It is unrelated to mirror alignment, so use it only for suitable household surfaces.

How can you tell when to stop adjusting?

Stop when the outgoing and return beams meet their intended marks and stay there after the collimator is reseated. Rechecking helps catch a clamp shift or a change caused by tightening a lock.

Avoid repeated large turns once the beam is close. If the spot jumps unexpectedly, return to the last stable position and check the focuser fit, laser alignment, and telescope instructions.

A laser is a tool for alignment, not a reason to keep chasing tiny movements indefinitely. Confirm the result with the method recommended for your telescope, especially if stars still look distorted or the view has not improved.

What is the safest way to use the collimator?

Keep the beam away from eyes, faces, and reflective surfaces. Never look into the laser or point it at another person, and turn it off before removing or storing it.

Work indoors or in a shaded area where you can clearly see the beam target. If the telescope is outside, keep the tube pointed away from the Sun throughout setup and adjustment.

Store the collimator where it won't be dropped or switched on accidentally. A damaged or loose laser should be checked before the next alignment.

Which steps matter most when using an Apertura laser collimator?

When learning how to use an Apertura laser collimator, focus on three checks: a stable focuser fit, a centered outgoing beam, and a centered return beam. Verify the laser itself before making mirror changes.

If the beam moves when rotated, address the collimator first. If it stays steady but shifts when clamped, correct the fit; then use the telescope's manual to finish the mirror adjustments.

Frequently asked questions

How do you use an Apertura laser collimator?

Seat it fully and squarely in the focuser, then turn it on and center the beam on the secondary mirror's center mark by adjusting the secondary screws. Next, adjust the primary mirror until the return beam reaches the collimator's target.

Follow the telescope and collimator manuals, and verify the laser is aligned before relying on it.

Does a laser collimator need to be collimated?

Yes, check that the laser itself is aligned before using it to adjust telescope mirrors. Rotate it in a stable holder and watch whether the beam stays on one point.

If it traces a circle, the laser may be misaligned or the holder may not be square, so resolve that before changing the telescope.

Which mirror do you adjust first with a laser collimator?

Center the outgoing beam on the secondary mirror's center mark first, using the secondary adjustment screws. Then adjust the primary mirror so the return beam reaches the collimator target.

The order matters because the primary adjustment depends on the outgoing beam being centered.

Can a laser collimate every telescope?

A laser collimator is mainly used to align mirrors in Newtonian reflectors. It doesn't replace the correct procedure for refractors, catadioptric telescopes, or every optical design.

Check your telescope's manual to confirm which alignment steps and tools apply to your model.