We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Baader Laser Colli Mark III 1.25 inch laser collimator, cylindrical metal body

Baader Planetarium

Baader Planetarium Laser Colli Mark III 1.25" laser collimator

SKU CH-HG2H-JV3N3

A 1.25" single-beam laser collimator with 1mW output and etched grid screen for precise Newtonian and Schmidt-Cassegrain alignment

  • Precise optical alignment with single-beam collimator design
  • Clear laser visibility in bright conditions with 1mW output
  • Fits 1.25" eyepiece holders on many telescopes
  • Easy fine adjustments using upright etched grid screen
  • Accurate collimation for Newtonian and Schmidt-Cassegrain reflectors

Precision 1.25" Laser Collimator

The Baader Laser Colli Mark III is a single-beam collimator built for Newtonian and Schmidt-Cassegrain reflector telescopes. It fits any 1.25" eyepiece holder, giving astronomers a direct way to align primary and secondary mirrors for sharper planetary and deep-sky views.

Passive Operation and 1mW Visibility

The device draws power only from its internal cell to run a 1mW laser, so it adds no heat, vibration or fan noise to the optical tube. The bright red beam remains easy to follow against a twilight sky or in a dim observatory, letting you centre the return spot on the etched grid without straining your eyes.

Drops Into Standard 1.25" Focusers

No adapters are required; the collimator seats directly in the focuser drawtube of any telescope that accepts 1.25" eyepieces. Its compact length leaves ample back-focus for Barlow lenses or cameras, and the clear grid screen provides an upright reference that speeds up the final fine-tuning step.

Highlights

  • Precise optical alignment with single-beam collimator design
  • Clear laser visibility in bright conditions with 1mW output
  • Fits 1.25" eyepiece holders on many telescopes
  • Easy fine adjustments using upright etched grid screen
  • Accurate collimation for Newtonian and Schmidt-Cassegrain reflectors

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the 1.25" laser collimator in my telescope, and what step is most often done incorrectly?

Insert the collimator into the 1.25" eyepiece holder and secure the compression ring or set-screws evenly so the body sits square; the common mistake is tightening one screw first, which tilts the beam and gives a false reading.

What maintenance or replacement will the laser collimator need over time?

The 1 mW laser diode will eventually dim; plan to replace the button-cell batteries when the etched grid screen becomes hard to see in ambient light.

What limit appears first during a long collimation session with the 1 mW laser?

Extended use drains the button cells, causing the beam to fade and the grid reference to lose contrast before any thermal drift occurs.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.