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Thread adapters

EBTOOLS 2 in to T2 adapter

A 2 in nosepiece adapter carrying a T2 male thread for the camera and an M48 internal thread for a filter, with a fully matted bore.

EBTOOLS 2 inch to T2 telescope camera adapter

EBTOOLS 2 in to T2 adapter

A 2 in nosepiece adapter carrying a T2 male thread for the camera and an M48 internal thread for a filter, with a fully matted bore.

Reduction factor
Not published by the maker.
Required back focus
Not published by the maker.
Image circle
Not published by the maker.
Corrector function
Not published by the maker.
Thread standards
2 in nosepiece for a 2 in focuser · M42 × 0.75 male — the T2 thread · M48 × 0.75 internal, at the front
Vignetting
“Full frame with 2 inch, no dark corners”, as the maker states it
Housing
Fully matted internal thread; black hard-anodised outside
Amazon reference
B07MCH2CVN (same reference on 5 Amazon marketplaces)
EAN
0719527383403
  • Carries an M48 filter thread at the front, so a 2 in filter fits in the same part
  • Fully matted bore, which matters immediately in front of a sensor
  • The no-dark-corners claim is made without naming a sensor size

Best for: Putting a T2-threaded camera into a 2 in focuser with a filter in the path

≈ £15 / €15
Check price on Amazon

Specifications

Reduction factor
Not published by the maker.
Required back focus
Not published by the maker.
Image circle
Not published by the maker.
Corrector function
Not published by the maker.
Thread standards
2 in nosepiece for a 2 in focuser · M42 × 0.75 male — the T2 thread · M48 × 0.75 internal, at the front
Vignetting
“Full frame with 2 inch, no dark corners”, as the maker states it
Housing
Fully matted internal thread; black hard-anodised outside
Amazon reference
B07MCH2CVN (same reference on 5 Amazon marketplaces)
EAN
0719527383403

What the part actually is

A 2 in nosepiece that slides into a focuser, with a T2 male thread at the back for a camera and an M48 female thread at the front for a filter. Three interfaces in one machined piece, and no optics anywhere in it.

The filter thread is the useful detail

Most 2 in nosepieces make you choose between a filter and an adapter. This one carries both, which removes a joint from the train and a few millimetres from the back focus budget.

The claim without a format

“Full frame with 2 inch, no dark corners.” No sensor size is named, and the clear aperture is not published. A 2 in barrel threaded M48 passes roughly 46 mm, which is in the region of a full-frame diagonal — that is as far as this page will take it.

The listing itself

Several bullets repeat with keywords appended, and five are entirely empty. The technical content is concentrated in the second bullet, which is precise about all three interfaces.

Availability

German, French and Spanish Amazon stores ran from 15 € to 21 € 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 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 focal reducers

  • ECSiNG M48 to M42 adapter ring in black anodised aluminium

    ECSiNG M48 to M42 double-male adapter

    An anodised aluminium ring with M48 × 0.75 and M42 × 0.75 male threads, blackened inside, containing no optical element at all.

    Reduction factor
    Not published by the maker.
    Required back focus
    Not published by the maker.
    Image circle
    Not published by the maker.
    Corrector function
    Not published by the maker.
    Thread standards
    M48 × 0.75 and M42 × 0.75, both male
    Vignetting
    Not published by the maker.
    Housing
    Aluminium, black anodised, matt internal wall
    Amazon reference
    B0C773T289 (same reference on 5 Amazon marketplaces)
    EAN
    4895243556683
    • Both threads named with their pitch
    • A matt bore, which reduces the reflections a shiny adapter introduces
    • It reduces nothing: the category is wrong and this page says so

    Best for: Joining a female M48 component to a female T2 one

    ≈ £10 / €12
    Check price on Amazon
  • Oumij1 0.5x focal reducer with M28.5 thread

    Oumij1 0.5x reducer, M28.5 × 0.6

    A 0.5x reducer for 1.25 in eyepiece noses in an aluminium housing, with the same stated exclusions as its twin listing.

    Reduction factor
    0.5x, per the maker
    Required back focus
    Not published by the maker.
    Image circle
    Not published by the maker.
    Corrector function
    Focal reducer with optics
    Thread standards
    M28.5 × 0.6 — the standard 1.25 in filter thread · Screws onto the nose of a 1.25 in eyepiece
    Vignetting
    Not published by the maker.
    Housing
    Aluminium alloy
    Amazon reference
    B093ZSLSDJ (same reference on 4 Amazon marketplaces)
    EAN
    9182438203992
    • The thread is named correctly, which several neighbours on this shelf fail to do
    • The exclusions are published rather than discovered
    • Shares its entire description with another listing

    Best for: A second reducer, or a first one where price decides

    ≈ €21
    Check price on Amazon
  • Skyoptikst f/6.3 reducer-corrector with SCT thread

    Skyoptikst f/6.3 reducer-corrector for SCT

    A four-element fully multi-coated reducer-corrector that threads onto the rear cell of a Schmidt-Cassegrain and converts f/10 to f/6.3.

    Reduction factor
    f/10 to f/6.3, as the maker states it
    Required back focus
    The listing gives none
    Image circle
    Not published by the maker.
    Corrector function
    Reducer and field corrector with optics — four elements
    Thread standards
    Schmidt-Cassegrain rear thread
    Vignetting
    Not published by the maker.
    Housing
    Fully multi-coated, per the maker · Aluminium alloy; all optical glass elements per the maker
    Amazon reference
    B0CN9CVSBP (same reference on 6 Amazon marketplaces)
    EAN
    0741754671657
    • Four elements correct the field as well as reducing, which a two-element reducer does not
    • The conversion is published as a pair of focal ratios rather than as a bare factor
    • The required distance to the sensor is not published, and a reducer has no tolerance on it

    Best for: A Schmidt-Cassegrain used for imaging, where f/10 makes exposures impractically long

    ≈ $95 / £93 / €109
    Check price on Amazon

The rest of this rack

  • SVBONY 1.25 inch CLS light pollution filter

    SVBONY CLS 1.25 in (FUSF9155A)

    A CLS broadband filter publishing 90 per cent transmission at the hydrogen, oxygen and sulphur lines and 0.1 per cent at the sodium and mercury lines of artificial lighting.

    Blocked wavelengths and published curve
    90 % at Hα 656 nm, O-III 496 and 500 nm, S-II 672 nm and Hβ 486 nm, as the maker publishes it
    LED and sodium behaviour
    0.1 %, named at Na 589 and 578 nm and Hg 435 nm
    Visual or photographic design
    CLS broadband filter, threaded for 1.25 in eyepieces and camera noses
    Colour cast
    Planetary rotation coating system, for uniformity — the maker’s own description
    Thread size
    Not published by the maker.
    Focal ratio limits
    Not published by the maker.
    Amazon reference
    B079BWD595 (same reference on 6 Amazon marketplaces)
    EAN
    0609378745577
    • The only filter on this shelf to publish both in-band and off-band transmission with named wavelengths
    • The blocked lines are named by element, which is what allows the claim to be checked against physics
    • A broadband filter helps less than a narrowband one under heavy light pollution

    Best for: Imaging or observing emission nebulae from a town, with a colour camera or by eye

    ≈ $32 / €46
    Check price on Amazon
  • Celestron 94107 variable polarising moon filter

    Celestron Variable Polarizing Moon Filter (94107)

    A two-element polarising filter for 1.25 in eyepieces with transmission adjustable from 1 to 40 per cent by rotating its lower ring.

    Transmission percentage
    1 % to 40 %, adjustable, as the maker publishes it
    Neutral or tinted dimming
    Not published by the maker.
    Fixed or variable design
    Variable polarising filter, threaded for 1.25 in eyepieces · Rotate the lower ring, per the maker · Threaded on both faces, so other filters can be combined with it
    Thread size
    Not published by the maker.
    Glass flatness
    Not published by the maker.
    Cell depth
    Not published by the maker.
    Amazon reference
    B07N99RW5K (same reference on 6 Amazon marketplaces)
    EAN
    0050234941075
    • A published transmission range rather than a single fixed figure or a colour word
    • One filter covers what several fixed neutral filters would
    • A polarising pair costs some light even at its most open setting

    Best for: The Moon across its whole cycle, where a fixed filter is right at only one phase

    ≈ $43 / £42 / €38
    Check price on Amazon
  • Omegon Premium 2 inch moon filter with 25 per cent transmission

    Omegon Premium Moon Filter 25 % 2 in

    A neutral grey Moon filter passing 25 per cent of the light, threaded for 2 in eyepieces, intended to dim the Moon without tinting it.

    Transmission percentage
    25 %, as the maker publishes it
    Neutral or tinted dimming
    Neutral — the Moon keeps its natural appearance, per the maker
    Fixed or variable design
    Neutral grey filter, threaded for 2 in eyepieces
    Thread size
    2 in filter thread
    Glass flatness
    Not published by the maker.
    Cell depth
    Not published by the maker.
    Amazon reference
    B018TN4TCO (same reference on 6 Amazon marketplaces)
    EAN
    4049467474043
    • The transmission is published as a percentage rather than a word
    • Neutral rather than tinted, so lunar colour is not altered
    • A single fixed value suits one range of phases and apertures

    Best for: A wide-field 2 in eyepiece used on the Moon at first or last quarter

    ≈ €39
    Check price on Amazon

All focal reducers