Skip to content

Brand

ECSiNG

Double-male thread couplings

What these actually are

Both products are rings with a male thread on each face. They exist to join two female threads that would otherwise not meet. Neither reduces a focal length, and neither holds a filter.

Why the shelf says otherwise

They were catalogued among reducers and wheels. The pages here open by saying what the part is, because a buyer who reads the shelf name and stops will order the wrong thing.

What decides whether it fits

The two thread designations, and the optical path the ring adds. The second figure is the one most often missing, and its absence is reported.

Reading an ECSiNG page here

Read the first line. It is there precisely because the category is misleading.

Everything ECSiNG puts on these shelves, one page each

  • ECSiNG M48 to M42 double-male adapter ring

    ECSiNG M48 male to M42 male adapter

    A male-to-male ring joining M48 × 0.75 to M42 × 0.75 with the shortest possible mechanical length, blackened inside against reflections.

    Slot count and filter size
    M48 × 0.75 and M42 × 0.75, both male
    Optical path length
    Described as the minimum mechanically possible; no figure is given
    Manual or motorised operation
    A thread adapter — no optics, and not a filter wheel
    Light sealing
    Aluminium, anodised black with a matt internal wall
    Power
    Not published by the maker.
    Software support
    Not published by the maker.
    Amazon reference
    B0C7BYJ588 (same reference on 5 Amazon marketplaces)
    EAN
    4895243557307
    • The matt internal finish addresses internal reflections, which few adapter listings mention
    • Both threads are named with their pitch
    • A double-male ring only helps where both sides are female — which is not every junction

    Best for: Joining two female-threaded components of different sizes in an imaging train

    ≈ €10
    Check price on Amazon
  • 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

Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.