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Collimators

Bresser Newtonian laser collimator (4910200)

A 1.25 in laser collimator in an adjustable aluminium housing, with a roughened surface for reading the return beam, published at 212 g.

Bresser laser collimator in black anodised aluminium

Bresser Newtonian laser collimator (4910200)

A 1.25 in laser collimator in an adjustable aluminium housing, with a roughened surface for reading the return beam, published at 212 g.

Method
Laser collimator
Self-collimation ability
Adjustable anodised aluminium
Barrel fit
31.7 mm (1.25 in)
Play
Not published by the maker.
Brightness control
Not published by the maker.
Target visibility
Roughened, so the reflected spot can be seen
Build
212 g, as the maker publishes it · Not mentioned in the listing
Suitable telescopes
Newtonian, Schmidt-Newtonian and Maksutov-Newtonian, as the maker lists them
Amazon reference
B00ADENLT0 (same reference on 5 Amazon marketplaces)
EAN
4007922002767
  • An adjustable housing means the tool itself can be trued, which is the precondition for trusting it
  • The three suitable telescope types are named rather than left as “reflectors”
  • No wavelength or output power figure is published

Best for: Collimating a Newtonian in the dark without a second person or a second tool

≈ £75 / €75
Check price on Amazon

Specifications

Method
Laser collimator
Self-collimation ability
Adjustable anodised aluminium
Barrel fit
31.7 mm (1.25 in)
Play
Not published by the maker.
Brightness control
Not published by the maker.
Target visibility
Roughened, so the reflected spot can be seen
Build
212 g, as the maker publishes it · Not mentioned in the listing
Suitable telescopes
Newtonian, Schmidt-Newtonian and Maksutov-Newtonian, as the maker lists them
Amazon reference
B00ADENLT0 (same reference on 5 Amazon marketplaces)
EAN
4007922002767

What a laser collimator does

It sends a beam down the tube along the focuser axis. Where that beam lands on the primary, and where its reflection returns, tells you whether the two mirrors are aligned. Done in the dark, alone, in a couple of minutes — which is the whole argument for a laser over an optical eyepiece.

The adjustable housing is the important part

A laser whose own beam is not square to its barrel aligns a telescope confidently wrong. The only defence is being able to check and correct the tool, and Bresser’s housing is described as adjustable. Rotating it in the focuser and watching the dot is the test.

The roughened face

The return beam has to land somewhere visible. A polished surface reflects it away; a roughened one scatters enough for the eye to read it. It is a small manufacturing decision that decides whether the tool works at all.

The blanks in the listing

Wavelength, output power and battery type. The Astromania collimator on this shelf publishes all three; this listing publishes none of them.

Availability

German, Italian and Spanish Amazon stores ran from 75 € to 86 € on the day of the survey.

American and British Amazon stores list it in local currency, which the euro range above sets aside.

French Amazon store gave no result whatever, so the buy button there opens a search rather than an empty page.

Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.

Prices quoted in this text were read on 17 September 2026. The live price is at the top of the page.

What this fits

More collimators

  • Jadeshay collimating eyepiece with red crosshair

    Jadeshay Collimating eyepiece with crosshair

    An aluminium collimating eyepiece with a red crosshair and a long tube, working without any power source at all.

    Method
    Optical collimating eyepiece — not a laser, and it needs no battery
    Self-collimation ability
    Not published by the maker.
    Barrel fit
    1.25 in
    Play
    Not published by the maker.
    Brightness control
    Not published by the maker.
    Target visibility
    Red crosshair · Described by the maker as unusually long for better accuracy · Treated to reduce reflections, per the maker
    Build
    Aluminium alloy
    Suitable telescopes
    Newtonian, per the maker
    Amazon reference
    B07KBXNRNH (same reference on 5 Amazon marketplaces)
    EAN
    0788051500754
    • No battery to go flat, which is the failure mode of every laser on this shelf
    • A long tube genuinely improves the accuracy of a sighting collimator
    • It needs enough light to see the reticle, which means a torch in the dark

    Best for: Anyone who would rather have a tool with nothing in it to fail

    ≈ £21 / €23
    Check price on Amazon
  • POFET metal collimator with 2 inch adapter

    POFET Metal collimating eyepiece with 2 in adapter

    A metal collimator with a triple-cemented lens and a built-in battery offering seven brightness levels, supplied with a 2 in adapter.

    Method
    Triple-cemented lens, per the maker
    Self-collimation ability
    Not published by the maker.
    Barrel fit
    1.25 in, with a 2 in adapter
    Play
    Not published by the maker.
    Brightness control
    Seven · Neither is published
    Target visibility
    Not published by the maker.
    Build
    Built-in battery, described as power-saving
    Suitable telescopes
    Newtonian, per the maker
    Amazon reference
    B08M9FRYXP (same reference on 5 Amazon marketplaces)
    EAN
    0703355530023
    • The maker describes the actual procedure rather than only the product
    • A built-in battery removes the CR2032 problem on a cold night
    • A built-in battery cannot be replaced when it eventually fails

    Best for: A Newtonian owner who would rather charge a tool than keep spare cells

    ≈ £23 / €26
    Check price on Amazon
  • Seben LK1 laser collimator with metal housing

    Seben LK1 laser collimator

    A 1.25 in laser collimator in a metal housing for aligning Newtonian reflectors, with no wavelength, power or adjustment detail published.

    Method
    Laser collimator
    Self-collimation ability
    Metal · Not mentioned
    Barrel fit
    31.7 mm (1.25 in)
    Play
    Not published by the maker.
    Brightness control
    Neither is published
    Target visibility
    Not published by the maker.
    Build
    Not mentioned
    Suitable telescopes
    Newtonian reflectors, per the maker
    Amazon reference
    B006FGYWM0 (same reference on 5 Amazon marketplaces)
    EAN
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    • A metal housing rather than plastic at a low price
    • The one job it is for is stated clearly
    • No wavelength, no output power and no battery type

    Best for: A first collimator where price decides and the tool will be checked on arrival

    ≈ £26 / €29
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The rest of this rack

  • Omegon six-piece 1.25 inch colour filter set in its case

    Omegon Colour filter set, 1.25 in, six pieces

    A six-filter 1.25 in colour set for planetary observing, with the maker naming #21 orange and #25 red and describing what each brings out.

    Wratten number
    Not published by the maker.
    Transmission
    The listing gives none for any filter in the set
    The features each colour raises
    Blocks blue and green, raising detail in the belts of Jupiter and Saturn; sharpens boundaries on Mars · Blocks blue and green almost entirely, for very high contrast on Jupiter and Saturn cloud detail
    Aperture suitability
    Not published by the maker.
    Set contents
    Six colour filters; the maker names #21 orange and #25 red
    Thread size
    1.25 in thread
    Amazon reference
    B0017GTVLK (same reference on 6 Amazon marketplaces)
    EAN
    4049467113331
    • Two of the six are named by Wratten number, which makes them comparable
    • The maker describes the effect of each named filter on specific planets
    • Four of the six filters are not identified by number in the listing

    Best for: A planetary observer with a telescope large enough to spend the light

    ≈ £57 / €63
    Check price on Amazon
  • Explore Scientific 1 kg counterweight for the iEXOS-100

    Explore Scientific 1 kg counterweight for iEXOS-100 (456101)

    A 1 kg counterweight for the iEXOS-100, published with all three of its dimensions as well as its mass.

    Mass
    1.0 kg, as the maker publishes it
    Bore diameter
    14.7 mm, as the maker publishes it
    Locking method
    Not published by the maker.
    Coating
    Not published by the maker.
    Finish
    Not published by the maker.
    Compatible mounts
    iEXOS-100
    Overall dimensions
    80 mm, as the maker publishes it · 30 mm, as the maker publishes it
    Amazon reference
    B07P7WJBVW (same reference on 5 Amazon marketplaces)
    EAN
    4007922060743
    • The only counterweight on this shelf to publish all four figures
    • An 80 mm diameter is small enough to clear most tripods
    • A 14.7 mm bore is specific and will not fit the 20 mm shafts of larger mounts

    Best for: Fine-balancing an iEXOS-100 after adding a camera or a guide scope

    ≈ £31 / €31
    Check price on Amazon
  • Sky-Watcher Star Adventurer counterweight kit in black

    Sky-Watcher Star Adventurer counterweight kit (S20540)

    A counterweight and threaded shaft kit for the Star Adventurer, explicitly excluding the GTi version, with two mutually inconsistent weight figures.

    Mass
    The listing prints 11.3 kg
    Bore diameter
    The listing gives none
    Locking method
    Not published by the maker.
    Coating
    Not published by the maker.
    Finish
    Not published by the maker.
    Compatible mounts
    A counterweight with a threaded counterweight shaft · Star Adventurer · Star Adventurer GTi, stated by the maker
    Overall dimensions
    Not published by the maker.
    Amazon reference
    B00XX646MG (same reference on 6 Amazon marketplaces)
    EAN
    0050234205405
    • The shaft is included, not just the weight
    • The incompatible model is named outright, which prevents a common mistake
    • The two published weights are inconsistent with each other

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    ≈ $40 / £44 / €55
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All collimators