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Collimators

SVBONY Collimating eyepiece with 2 in adapter (EUF9123A)

A metal collimator supplied with a 2 in adapter so it fits both focuser sizes, with a triplet lens and seven brightness settings.

SVBONY collimator with 2 inch adapter

SVBONY Collimating eyepiece with 2 in adapter (EUF9123A)

A metal collimator supplied with a 2 in adapter so it fits both focuser sizes, with a triplet lens and seven brightness settings.

Method
Triplet lens, described by the maker as reducing distortion and spherical aberration
Self-collimation ability
Not mentioned
Barrel fit
1.25 in, with a 2 in adapter supplied
Play
Not published by the maker.
Brightness control
Seven, from 0 to 7 per the maker · Neither is published
Target visibility
Not published by the maker.
Build
Metal
Suitable telescopes
Newtonian and Schmidt-Cassegrain reflectors, 1.25 in and 2 in
Amazon reference
B013SMDQSY (same reference on 5 Amazon marketplaces)
EAN
0635266493268
  • The 2 in adapter is supplied rather than sold separately
  • A triplet lens is specified, which is unusual detail for a collimator
  • No wavelength or output figure

Best for: An observer with both a 1.25 in and a 2 in focuser who wants one collimator for both

≈ £35 / €36
Check price on Amazon

Specifications

Method
Triplet lens, described by the maker as reducing distortion and spherical aberration
Self-collimation ability
Not mentioned
Barrel fit
1.25 in, with a 2 in adapter supplied
Play
Not published by the maker.
Brightness control
Seven, from 0 to 7 per the maker · Neither is published
Target visibility
Not published by the maker.
Build
Metal
Suitable telescopes
Newtonian and Schmidt-Cassegrain reflectors, 1.25 in and 2 in
Amazon reference
B013SMDQSY (same reference on 5 Amazon marketplaces)
EAN
0635266493268

One tool, two focuser sizes

A 1.25 in body with a 2 in adapter in the box. Anyone who owns both a small refractor and a large Newtonian needs both fittings, and buying the adapter separately means buying one whose squareness is unknown.

The triplet

Three cemented elements to sharpen the projected beam. A tighter spot is easier to judge against a centre mark, and this is the only collimator on this shelf that says anything at all about its own optics.

Seven steps of brightness

Zero to seven. Bright for daylight, where the return spot has to compete with ambient light; dim for night, where a bright spot costs dark adaptation. The range is the useful specification here.

What the listing does not address

Whether the tool can be trued. Every laser collimator should be rotated in the focuser and checked, and one that cannot be corrected has to be returned rather than adjusted. Nothing here says which this is.

Availability

German, French, Italian and Spanish Amazon stores ran from 36 € to 40 € on the day of the survey.

British Amazon store lists it in local currency, which the euro range above sets aside.

American 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

  • Astromania 1.25 inch laser collimator in anodised aluminium

    Astromania Next-generation 1.25 in laser collimator (ZAA1025)

    A metal-bodied laser collimator with seven brightness steps, a published wavelength band and output figure, and three sealed adjustment ports for trueing the tool itself.

    Method
    Laser collimator
    Self-collimation ability
    Three ports at 120°, initially sealed behind a screw cap at the rear
    Barrel fit
    Standard 1.25 in
    Play
    Not published by the maker.
    Brightness control
    635–655 nm, as the maker publishes it · Less than 5 mW, as the maker states it · Seven
    Target visibility
    Not published by the maker.
    Build
    CR2032 lithium; the maker states it is not supplied
    Suitable telescopes
    Not published by the maker.
    Amazon reference
    B01D8HMBCQ (same reference on 5 Amazon marketplaces)
    EAN
    6970019295022
    • Wavelength and output power are both published, which is rare on this shelf
    • Three adjustment ports at 120° let the tool be trued rather than trusted
    • The battery is not supplied and CR2032 cells are easy to be without on the night

    Best for: A Newtonian owner who wants a laser they can check and correct themselves

    ≈ $26 / £32
    Check price on Amazon
  • 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
  • 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

The rest of this rack

  • SVRITE 1 kg stainless steel counterweight

    SVRITE 1 kg stainless steel counterweight

    A 1 kg stainless steel counterweight with a 20.5 mm bore, sold for equatorial mounts, with no bullet points in the listing.

    Mass
    1 kg, from the title
    Bore diameter
    20.5 mm, from the title
    Locking method
    The listing gives none
    Coating
    Stainless steel, from the title
    Finish
    Not published by the maker.
    Compatible mounts
    Not published by the maker.
    Overall dimensions
    The listing gives none
    Amazon reference
    B0CQZKVBP7 (same reference on 6 Amazon marketplaces)
    EAN
    4713737267382
    • Both the mass and the bore appear in the title, which is what a counterweight needs
    • Stainless steel resists the corrosion that pits a painted cast weight
    • No description at all beyond the title

    Best for: A 20 mm counterweight shaft that needs a small additional mass

    ≈ €34
    Check price on Amazon
  • Vixen 1.9 kg white counterweight

    Vixen 1.9 kg counterweight (2577-06)

    A 1.9 kg counterweight for seven named Vixen mounts, for balancing an increased payload.

    Mass
    1.9 kg, as the maker publishes it
    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
    SX, SX2, SXD, SXD2, SXP, GP2 and GPD2, all named
    Overall dimensions
    The listing gives none
    Amazon reference
    B002P4KLR6 (same reference on 5 Amazon marketplaces)
    EAN
    4955295257706
    • Seven compatible mounts named individually rather than by family
    • A 1.9 kg increment suits fine balancing on a medium mount
    • The bore diameter is not published, which is the figure that decides fit

    Best for: A Vixen SX or GP mount carrying more than it was balanced for

    ≈ £49 / €52
    Check price on Amazon
  • Astromania flexible dew shield wrapped on a telescope tube

    Astromania Flexible dew shield 148–167 mm (FDS580)

    A flexible black ABS dew shield with a velvet lining and a foam contact strip, for tube outside diameters of 148 to 167 mm.

    Tube fit
    148 to 167 mm, as the maker publishes them
    Outside diameter
    Not published by the maker.
    Shield length
    200 mm, as the maker publishes it · 580 mm, as the maker publishes it
    Construction
    Flexible wrap-around dew shield · Black ABS, lined with a black velvet-like fabric · Non-slip foam rubber against the tube · Hook-and-loop, adjustable within the range
    Heater width
    Not published by the maker.
    Power draw
    Not published by the maker.
    Controller support
    Not published by the maker.
    Cable
    Not published by the maker.
    Connector
    Not published by the maker.
    Amazon reference
    B01LZPCQBV (same reference on 6 Amazon marketplaces)
    EAN
    6970019295695
    • Four published dimensions where most dew shields give one vague size
    • A velvet lining does two jobs: it absorbs moisture and it kills stray light
    • The diameter to measure is the tube outside, not the aperture — an easy mistake

    Best for: A 150 mm reflector or a Schmidt-Cassegrain whose front diameter has been measured

    ≈ $36 / £44
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All collimators