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T-ring adapters

Walimex pro T2 adapter for M42 mount (23367)

A mechanical transition ring letting T2-threaded telescopes and accessories be fitted to a camera with an M42 screw mount, with manual focus only.

Walimex pro T2 to M42 mount adapter ring

Walimex pro T2 adapter for M42 mount (23367)

A mechanical transition ring letting T2-threaded telescopes and accessories be fitted to a camera with an M42 screw mount, with manual focus only.

Camera mount
T2 equipment onto an M42-mount camera — the reverse of a standard astronomy T-ring
T2 thread
The pitches of the two threads are not published
Flange distance
Not published by the maker.
Prime focus or projection design
Purely mechanical transition ring, per the maker
Blackening
Not published by the maker.
Material
Not published by the maker.
Amazon reference
B0C6DYVMGG (same reference on 6 Amazon marketplaces)
EAN
4056929233674
  • The maker is explicit that it carries no contacts and gives manual focus only
  • Names bellows and microscope adapters as well as telescopes
  • It goes the opposite way from a normal astronomy T-ring, which is easy to misread

Best for: An M42 screw-mount camera body used with T2 astronomical or laboratory equipment

≈ £27 / €20
Check price on Amazon

Specifications

Camera mount
T2 equipment onto an M42-mount camera — the reverse of a standard astronomy T-ring
T2 thread
The pitches of the two threads are not published
Flange distance
Not published by the maker.
Prime focus or projection design
Purely mechanical transition ring, per the maker
Blackening
Not published by the maker.
Material
Not published by the maker.
Amazon reference
B0C6DYVMGG (same reference on 6 Amazon marketplaces)
EAN
4056929233674

The direction is the thing to notice

Every other T-ring on this shelf converts the T2 thread to a modern camera bayonet. This one does the opposite: it lets T2 equipment be fitted to a camera body that already has an M42 screw mount. Reading it the wrong way round is the easiest mistake to make here.

Purely mechanical, and the maker says so

No contacts, no autofocus drive, no aperture control, manual focus only. For a telescope that changes nothing — a telescope has no electronic aperture and focuses with its own focuser — and for a photographic lens it changes a great deal.

The two M42s

The historic camera screw mount is M42 × 1.0; T2 is M42 × 0.75. They share a diameter and differ in pitch and in flange distance, and they will start on each other and bind. That distinction is exactly what this adapter navigates, and neither pitch is printed in the listing.

What it genuinely does

Bellows units, microscope adapters and telescopes with T2 threads, on a body that takes M42. That is a narrow and real set of situations, and the maker names all of them.

Availability

German, French and Spanish Amazon stores ran from 20 € to 28 € on the day of the survey.

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

Italian Amazon store stood above 1.6× the cheapest country. A gap that size normally means stock forwarded from abroad rather than a seller on the ground, so that figure is left out of the range above.

American Amazon catalogue holds a record for it that nobody is selling.

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 t-ring adapters

  • VBESTLIFE 2 inch T2 telescope adapter ring

    VBESTLIFE T2 adapter ring, 2 in

    A 2 in T2 adapter ring in all-metal construction, with an internal surface pattern intended to cut reflections.

    Camera mount
    Not published by the maker.
    T2 thread
    Not stated
    Flange distance
    Not published by the maker.
    Prime focus or projection design
    T2 adapter with a 2 in telescope fitting · 2 in eyepiece diameter, per the maker
    Blackening
    A pattern inside the ring to reduce reflection, per the maker
    Material
    All-metal precision, per the maker
    Amazon reference
    B0824YGXF1 (same reference on 5 Amazon marketplaces)
    EAN
    0738586139776
    • A 2 in fitting rather than 1.25 in, which suits larger focusers and sensors
    • The internal anti-reflection pattern is mentioned rather than ignored
    • No thread pitch, no length, no weight and no clear aperture

    Best for: A 2 in focuser and a T2-threaded camera, where the details will be measured on arrival

    ≈ £13 / €25
    Check price on Amazon
  • YINETTECH T2 to Canon RF mount adapter

    YINETTECH T2 to Canon RF adapter (290-EB)

    An alloy adapter converting the T2 thread to the Canon RF mount, with no glass inside, for EOS R series mirrorless cameras.

    Camera mount
    Canon RF — the EOS R series
    T2 thread
    T2, named by the maker as M42 × 0.75
    Flange distance
    Not published by the maker.
    Prime focus or projection design
    T-ring for a mirrorless mount
    Blackening
    None, stated outright by the maker
    Material
    Alloy
    Amazon reference
    B0G672S7CN (same reference on 6 Amazon marketplaces)
    EAN
    4894833259447
    • States explicitly that it contains no optics, which is the right claim for a mount adapter
    • Covers the RF mount that the EF-only rings on this shelf exclude
    • No thickness figure, which is part of the flange distance arithmetic

    Best for: A Canon EOS R body at the camera end of a telescope imaging train

    ≈ $14 / £14 / €16
    Check price on Amazon
  • Your Day Mate T2 adapter ring for Canon EF and EF-S in black aluminium

    Your Day Mate T2 adapter ring for Canon EF/EF-S (YODM1-1094)

    A slim CNC-machined T2 ring for Canon EF and EF-S bayonets, with the incompatible Canon systems named outright.

    Camera mount
    Canon EOS with EF and EF-S bayonets
    T2 thread
    T2, named by the maker as M42 × 0.75
    Flange distance
    Not published by the maker.
    Prime focus or projection design
    T-ring — converts the T2 thread to a camera bayonet
    Blackening
    Not published by the maker.
    Material
    CNC-machined black anodised aluminium
    Amazon reference
    B0FR59P92W (same reference on 6 Amazon marketplaces)
    EAN
    4252009210942
    • Names the thread precisely as M42 × 0.75 rather than only as “T2”
    • States which Canon systems it does not fit, which prevents the commonest mistake
    • A T-ring alone does not connect a telescope: a nosepiece or adapter is still needed

    Best for: A Canon DSLR with an EF or EF-S bayonet, at the camera end of an imaging train

    ≈ €10
    Check price on Amazon

The rest of this rack

  • USA Gear extendable refractor telescope case with shoulder strap

    USA Gear Refractor telescope case (GRSLS01100BKEW)

    An extendable padded case for a refractor and tripod, published with its length range, both widths and its fully extended length.

    Internal dimensions
    53.3 to 88.9 cm, as the maker publishes it · 91.4 cm, as the maker publishes it · 17.8 cm · 10.1 cm
    Foam type
    Not published by the maker.
    Shell material
    Water-repellent, padded
    Sealing
    Not published by the maker.
    Internal dividers
    Not published by the maker.
    Load rating
    Not published by the maker.
    Handles
    Handle and adjustable shoulder strap · Named for eyepieces, monocular, camera, phone adapter, filters, torch and cleaning kit
    Empty weight
    Not published by the maker.
    Latches
    Not published by the maker.
    Amazon reference
    B0BFXL4VGB (same reference on 6 Amazon marketplaces)
    EAN
    0637836618415
    • Four published dimensions, including both widths — the most complete figures on this shelf
    • An adjustable length means one case fits telescopes of different sizes
    • The tapered shape suits a refractor and not a wide reflector tube

    Best for: A refractor on a tripod, where the tapered profile matches the shape

    ≈ $25 / £25
    Check price on Amazon
  • Celestron 40 inch full kit telescope bag in black

    Celestron 40 in full kit telescope bag (94025)

    A 40 inch padded bag taking a telescope, mount, tripod and accessory trays, with movable internal walls and a PVC-reinforced base.

    Internal dimensions
    40 inches, from the product name
    Foam type
    16 mm EPE foam inserts, as the maker publishes it
    Shell material
    900 denier, per the maker
    Sealing
    Not published by the maker.
    Internal dividers
    Configurable, per the maker
    Load rating
    Not published by the maker.
    Handles
    Two openings
    Empty weight
    Not published by the maker.
    Latches
    Not published by the maker.
    Amazon reference
    B08VF6M3G3 (same reference on 6 Amazon marketplaces)
    EAN
    0050234940252
    • Publishes both the outer material weight and the foam thickness
    • Configurable walls mean one bag serves several configurations over time
    • Only the overall length is published; no internal width or height

    Best for: Carrying a complete telescope, mount and tripod in one bag

    ≈ $105 / £127 / €143
    Check price on Amazon
  • Wiltec IP67 universal protective case with cube foam

    Wiltec Universal case 32 × 22.9 × 11.2 cm (65520)

    A rigid IP67 case in polypropylene and glass fibre with cube foam, published with both its external and internal dimensions.

    Internal dimensions
    32 × 22.9 × 11.2 cm, as the maker publishes them · 30 × 19 × 9 cm, as the maker publishes them
    Foam type
    Cube foam, cut to shape by hand
    Shell material
    Polypropylene with glass fibre
    Sealing
    IP67
    Internal dividers
    An internal frame allows dividers without drilling, preserving the IP67 rating
    Load rating
    Not published by the maker.
    Handles
    Not published by the maker.
    Empty weight
    Not published by the maker.
    Latches
    Not published by the maker.
    Amazon reference
    B0DWNFWQ7Z (same reference on 6 Amazon marketplaces)
    EAN
    4251548165232
    • Both external and internal dimensions published, which nothing else on this shelf manages
    • IP67 is a real rating rather than the word “waterproof”
    • Nine centimetres of internal depth will not take a large 2 in eyepiece standing

    Best for: Filters, small eyepieces and a camera, kept dry and dust-free

    ≈ £39 / €33
    Check price on Amazon

All t-ring adapters