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The only page here that publishes what the reach costs

VILTROX 2× for Canon EF, exposure factor about 4

A 2× converter for Canon EF that publishes both things this shelf asks for and rarely gets: the light it costs — two stops — and the five lenses it fits.

Viltrox C-AF 2X II teleconverter with its aperture lever and USB port

VILTROX 2× for Canon EF, exposure factor about 4

A 2× converter for Canon EF that publishes both things this shelf asks for and rarely gets: the light it costs — two stops — and the five lenses it fits.

Magnification
2×, in the first bullet, doubling the focal length of Canon EF lenses. A 100-400 mm becomes a 200-800 mm, which is the reason anybody buys one
Lenses named as compatible
PUBLISHED, and published as a limit: the second bullet says it is compatible ONLY with L-series fixed focal lengths of 135 mm and above, plus the EF 70-200 mm f/2.8L, the f/2.8L IS, the f/4L and the EF 100-400 mm f/4.5-5.6L. The intro above explains why the list is the gate rather than the mount: a converter protrudes, and fitting one to an unlisted lens can mean contact with the rear element
Light loss in stops
PUBLISHED — an exposure factor of about 4, which the first bullet itself translates as the equivalent of 2 apertures. It is the only page on this shelf to state the cost, and it matches the arithmetic the intro above gives for every 2×: an f/2.8 lens behind it works at f/5.6, an f/4 at f/8
Autofocus limits stated
Autofocus is claimed — the third bullet says the lens autofocus function is supported, with improved performance, fast focusing and reliable subject tracking — and NO minimum aperture is stated. The buying advice on this shelf asks for exactly that figure, because an f/4 lens becomes f/8 here and some bodies stop focusing there
Added length
Not published. Seven elements in four groups is the optical construction, given twice; how much further forward the lens sits is not
Sealing
Not claimed. The 323 € OM SYSTEM, the 349 € Sigma and the 479 € Canon on this shelf all claim dust and splash protection; this one claims coatings against ghosting and flare instead
Published weight
Not published, as on all six converters here
Amazon reference
B08GC59HV2 (same reference on 6 Amazon marketplaces)
EAN
0086291917067
  • Two stops of light loss published, and translated into apertures on the page itself
  • Five lenses named, with the word "only" in front of the list
  • No minimum aperture for autofocus, on a converter that turns f/4 into f/8

Best for: One of the five Canon EF telephotos named on the page, when 400 mm has to become 800 and two stops can be spared.

≈ $115 / £133 / 169 €
Check price on Amazon

Specifications

Magnification
2×, in the first bullet, doubling the focal length of Canon EF lenses. A 100-400 mm becomes a 200-800 mm, which is the reason anybody buys one
Lenses named as compatible
PUBLISHED, and published as a limit: the second bullet says it is compatible ONLY with L-series fixed focal lengths of 135 mm and above, plus the EF 70-200 mm f/2.8L, the f/2.8L IS, the f/4L and the EF 100-400 mm f/4.5-5.6L. The intro above explains why the list is the gate rather than the mount: a converter protrudes, and fitting one to an unlisted lens can mean contact with the rear element
Light loss in stops
PUBLISHED — an exposure factor of about 4, which the first bullet itself translates as the equivalent of 2 apertures. It is the only page on this shelf to state the cost, and it matches the arithmetic the intro above gives for every 2×: an f/2.8 lens behind it works at f/5.6, an f/4 at f/8
Autofocus limits stated
Autofocus is claimed — the third bullet says the lens autofocus function is supported, with improved performance, fast focusing and reliable subject tracking — and NO minimum aperture is stated. The buying advice on this shelf asks for exactly that figure, because an f/4 lens becomes f/8 here and some bodies stop focusing there
Added length
Not published. Seven elements in four groups is the optical construction, given twice; how much further forward the lens sits is not
Sealing
Not claimed. The 323 € OM SYSTEM, the 349 € Sigma and the 479 € Canon on this shelf all claim dust and splash protection; this one claims coatings against ghosting and flare instead
Published weight
Not published, as on all six converters here
Amazon reference
B08GC59HV2 (same reference on 6 Amazon marketplaces)
EAN
0086291917067

On the listing

Five bullets. A 2× converter said to double the focal length of every Canon EF lens, built in 4 groups and 7 elements, with an exposure factor of about 4 — given as the equivalent of 2 apertures; compatibility with the Canon EF mount, with a note that it works only with L-series lenses of fixed focal length 135 mm and above, the EF 70-200 mm f/2.8L, the f/2.8L IS, the f/4L and the EF 100-400 mm f/4.5-5.6L; support for the lens autofocus function, with image quality credited to a new optical design, improved AF performance, fast focusing and accurate subject tracking; coatings optimised to minimise ghosting and flare, an aperture adjustment lever on the adapter for setting the aperture quickly, and an optical construction of 7 elements in 4 optical groups; and an updated USB firmware interface supporting upgrades that improve function and fix faults.

Two apertures, written on the page

No other converter on this shelf says what it takes. A factor of 4 is two stops: f/2.8 becomes f/5.6, f/4 becomes f/8. The buying advice on this shelf tells the reader to work that out before buying; here it is already worked out.

Five lenses, with “only” in front of them

A compatibility list that limits rather than reassures. The 349 € Sigma and the 479 € Canon on this shelf publish no list at all.

An aperture lever, on the converter

For lenses whose aperture is set electronically, a lever on the adapter is a manual override — and on a third-party chain between lens and body, having one is worth more than it looks.

A USB port, for the compatibility that arrives later

Firmware upgrades on a device that lives between two makers’ products. It is the only page here that can be improved after purchase.

Availability

About 169 € on the German, French, Italian and Spanish Amazon stores when this page was last checked.

The American and British Amazon stores carry it too, priced in local currency. Those amounts are deliberately absent from the range above, which reads euro stores only.

Everything in this section is the figure Keepa carried on the day of the last update to this page. Availability and prices shift without notice.

Prices quoted in this text were read on 13 September 2026. The live price is at the top of the page.

More teleconverters

  • Canon Extender RF 1.4x in light grey with its two caps and pouch

    Canon 1.4× for RF, three-layer combination lens

    Four hundred and seventy-nine euros for a 1.4× extender sealed against dust, splashes and heat, with a three-layer combination lens — and six bullets that name no lens.

    Magnification
    1.4×, in the first bullet, named for press, nature and sports photographers. One stop, by the arithmetic in the intro above — which this page does not state
    Lenses named as compatible
    NONE. Six bullets, and the compatibility statement is that the lens design is optimised for the RF mount. The intro above insists that a converter is sold with an explicit list precisely because it protrudes, and the 169 € Viltrox on this shelf names five lenses with the word "only". At 479 €, this is the most expensive silence on the shelf
    Light loss in stops
    Not published. One stop for a 1.4×: an f/2.8 lens works at f/4, an f/4 at f/5.6. The page never mentions it
    Autofocus limits stated
    Not stated, and autofocus is not mentioned in any of the six bullets — on a device sold to press and sports photographers, for whom focus is the whole purchase
    Added length
    Not published, where the 323 € OM SYSTEM publishes 15 mm
    Sealing
    The fullest claim on this shelf: dust and splash protection AND a heat-repellent coating, in the third bullet, described as ready for extreme situations. Heat resistance appears on no other page here, and it belongs to a converter that will sit on a white telephoto in the sun
    Published weight
    Not published, as on all six converters here
    Amazon reference
    B08CNFXJR9 (same reference on 6 Amazon marketplaces)
    EAN
    4549292168044
    • Dust and splash protection plus a heat-repellent coating, the only heat claim on this shelf
    • A three-layer combination lens and high-refractive low-dispersion glass, both named
    • Not one compatible RF lens named, in six bullets, at 479 €

    Best for: An RF telephoto already confirmed to accept it, used in heat and weather where the sealing and the coating earn their price.

    ≈ $553 / £519 / 479 €
    Check price on Amazon
  • Fujifilm TCL-X100 II silver teleconverter beside an X100 camera

    Fujifilm 1.4×, to 50 mm equivalent, for four X100 bodies

    Two hundred and thirty-nine euros for a 1.4× converter that takes the X100 series to a 50 mm equivalent — five short bullets, four named cameras, and no element count.

    Magnification
    1.4×, in the first bullet, given as extending the focal length to 50 mm in full-frame equivalent. The arithmetic is visible: 1.4 times a 35 mm equivalent is 49, and the page rounds it to 50 — which also tells the reader what lens is underneath
    Lenses named as compatible
    FOUR CAMERAS, not lenses: the X100, X100S, X100T and X100F, in the second bullet. It is the only page on this shelf whose compatibility list is made of bodies, and that makes it the easiest to check and the narrowest to satisfy
    Light loss in stops
    NOT PUBLISHED. The intro above gives one stop as the price of a 1.4× sitting between a lens and a body; this converter is sold for four cameras whose lens does not come off, and the page states no figure at all. Nothing here confirms or denies a loss
    Autofocus limits stated
    None. No aperture, no focus claim, no caveat — in five bullets, two of which are "silver" and a contents list
    Added length
    Not published
    Sealing
    Not claimed. The 323 € OM SYSTEM, the 349 € Sigma and the 479 € Canon here all claim dust and splash protection
    Published weight
    Not published, as on all six converters here
    Amazon reference
    B01MUCB83B (same reference on 6 Amazon marketplaces)
    EAN
    4547410339079
    • Four compatible cameras named outright, in a market where lists are usually absent
    • The result is published as a focal length — 50 mm equivalent — not only as a factor
    • Five bullets, of which one is the word "silver" and one a two-line contents list

    Best for: An X100, X100S, X100T or X100F used for portraits, where 35 mm is too wide and a second camera is not the answer.

    ≈ $239 / £211 / 239 €
    Check price on Amazon
  • NEEWER teleconverter clipped magnetically to the front of a DJI Osmo Pocket

    NEEWER For DJI Osmo Pocket 3 and 4, magnetic

    Sixty-four euros for a magnetic converter that clips to an Osmo Pocket 3 or 4 — and whose only published magnification is the 2× digital zoom already in the camera.

    Magnification
    NOT PUBLISHED for the converter itself. The second bullet says a higher magnification factor is reached by using the camera’s 2× DIGITAL zoom, which is a function of the camera and not of this glass. Every other page on this shelf leads with a factor — 1.4× or 2× — and this one leads with the camera’s crop
    Lenses named as compatible
    No lenses: two cameras. The first bullet says it is compatible only with the DJI Osmo Pocket 4 and Pocket 3, and the title says the same. This catalogue carries the Osmo Pocket 4 on its gimbal shelf, so the narrowest compatibility statement on this shelf is also the easiest to check
    Light loss in stops
    Not published. The intro above gives the arithmetic for converters that sit between a lens and a body — one stop for a 1.4×, two for a 2× — and this one attaches magnetically to the front of a fixed-lens camera, where that arithmetic does not apply. The page gives no figure either way
    Autofocus limits stated
    None. On a camera whose lens and body are one piece there is no aperture for the converter to reduce, and the page makes no claim about focus at all
    Added length
    Not published. The fourth bullet calls the lens light and slim and gives no millimetres — and on a pocket gimbal, length is exactly what decides whether it still fits in a pocket
    Sealing
    Not claimed as sealing. The third bullet describes multiple coatings that resist water, scratches and fingerprints, which protects the glass rather than the joint. Three converters on this shelf claim dust and splash protection; this is not one of them
    Published weight
    Not published — and not one of the six converters on this shelf publishes a weight, though the intro above asks for it
    Amazon reference
    B0G1RSMHRV (same reference on 6 Amazon marketplaces)
    EAN
    0191073127913
    • Four elements in three groups, multi-coated against water, scratches and fingerprints
    • A magnetic mount, so nothing is threaded onto a gimbal-mounted lens
    • No optical magnification figure anywhere on the page

    Best for: An Osmo Pocket 3 or 4 used for interviews and distant subjects, where a longer view is wanted without cropping into the sensor.

    ≈ $86 / £53 / 56 €
    Check price on Amazon

Elsewhere in the camera bag

  • PROfezzion 67 mm UV filter in its slim aluminium frame beside its padded case

    PROfezzion 67 mm, 99.5 per cent transmission, 0.7 mm glass

    The only filter on this shelf that publishes what it passes — 99.5 per cent on twelve layers, through 0.7 mm of glass in a 3 mm frame, for 13 €.

    Thread size
    67 mm, in the title, which also names Canon R6 Mark III, II, 90D, 80D and 70D bodies. Naming bodies on a filter is loose — a filter fits a thread, not a camera — but it tells a buyer the size is the common one for those kits
    Glass
    Japanese optical glass, finely ground and polished, in the third bullet, with a hardness given as up to 9HD. The hardness notation is unusual and unexplained on the page; what it is reaching for is scratch resistance on the surface that gets wiped most
    Coating description
    TWELVE layers, multi-coated, in the second bullet, to prevent internal ghosting and reflections. Fewer than the eighteen claimed by the 11 € K&F here — and unlike that page, this one publishes the result the layers produce
    Frame thickness
    BOTH figures published, and this is the page that measures itself: the GLASS is 0.7 mm thick and the FRAME only 3 mm, in the fourth bullet, stated as minimising the likelihood of vignetting. Three millimetres is the thinnest frame on this shelf, against 3.4 mm on the Hama and nothing at all from the two others
    Material
    An aviation-grade aluminium alloy frame, in the third bullet — the only frame alloy named on this shelf
    Front thread provision
    Not mentioned, which on a 3 mm frame is worth noting: the thinner the ring, the less room for a front thread, and the page does not say whether a cap or hood still screws on
    Stated transmission figure
    PUBLISHED — an average light transmission of AT LEAST 99.5 PER CENT, in the second bullet, and the only such figure on this shelf. It is the number that makes the coating count meaningful: twelve layers passing 99.5 per cent is a measurable claim, where eighteen layers and no percentage is an assertion
    Amazon reference
    B09366T36S (same reference on 6 Amazon marketplaces)
    EAN
    6940202350425
    • Ninety-nine point five per cent transmission published — alone on this shelf
    • Both thicknesses published: 0.7 mm of glass in a 3 mm frame, the thinnest here
    • No front thread provision mentioned, on the thinnest frame here

    Best for: A 67 mm lens used at its widest, where a 3 mm frame and a measured transmission are worth 4 € over the cheapest lid on this shelf.

    ≈ $13 / £11 / 12 €
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  • ayex battery grip on a Canon EOS 6D Mark II showing its portrait controls

    ayex For EOS 6D Mark II, two LP-E6, four controls

    Fifty-eight euros for the fullest vertical grip here: two LP-E6 cells and four duplicated controls on the EOS 6D Mark II, after the BG-E21.

    Bodies named
    ONE: the Canon EOS 6D Mark II, in the title and the first bullet, with the fourth naming the Canon BG-E21 as the design it follows. A single body is the narrowest compatibility on this shelf and the most certain — a grip is cut to one chassis
    Cells carried and reporting
    TWO LP-E6, published in the second bullet, which says the grip allows two cells to be used so there is no constant recharging or swapping — and the first bullet puts it as doubling the camera’s capability. Whether the body reports each cell separately is not described
    Duplicated controls
    THE FULLEST SET ON THIS SHELF, in the fifth bullet: a shutter release with TWO PRESSURE POINTS — half press for focus, full press to fire — an AF-ON button, an AE/FE lock and further functions, all placed for portrait-format use. Four controls against the one of the 38 € CELLONIC here
    Sealing claims
    None
    Tripod thread position
    The third bullet says the grip is FIXED TO THE CAMERA’S TRIPOD THREAD — which states how it mounts and, like every page on this shelf, never confirms that a replacement thread exists underneath
    Published weight
    None
    Amazon reference
    B0799NLHWZ (same reference on 6 Amazon marketplaces)
    EAN
    4250559526827
    • Four duplicated controls, including AF-ON and AE/FE lock
    • Two LP-E6 cells, doubling the run time
    • One body only — nothing else takes it

    Best for: An EOS 6D Mark II used for portraits or weddings, where the vertical hold has to offer the same controls as the horizontal one.

    ≈ £62 / 51 €
    Check price on Amazon
  • CELLONIC vertical battery grip fitted beneath a Nikon reflex body

    CELLONIC Vertical grip for Nikon D40 to D5000, portrait release

    Thirty-eight euros for a true vertical grip for five Nikon bodies, with a portrait shutter release and a spare cell — and no mention of dials, threads or weight.

    Bodies named
    FIVE, in the first bullet: the Nikon D5000, D3000, D60, D40 and D40x, for EN-EL9 and EN-EL9E cells — and the part-number field names the Nikon MB-D60, the original grip this copies. Naming the original is the clearest compatibility statement available
    Cells carried and reporting
    A SPARE BATTERY is included, in the fifth bullet, for longer sessions and continuous use. How many cells the grip holds, and whether the camera reads them individually, is not stated — which on a grip is the specification a photographer checks first
    Duplicated controls
    A SHUTTER RELEASE FOR PORTRAIT-FORMAT SHOOTING, in the third bullet — and that is what makes this a grip rather than a battery holder. What it does NOT claim is what the 58 € ayex here does: command dials, an AF-ON button, an exposure lock. One duplicated control, named
    Sealing claims
    None
    Tripod thread position
    NOT DESCRIBED. A vertical grip bolts into the camera’s own tripod socket and must provide a replacement underneath, or the camera cannot go on a tripod at all. The page never mentions it, on a product whose whole installation depends on that thread
    Published weight
    None
    Amazon reference
    B0BM9RT2D6 (same reference on 5 Amazon marketplaces)
    EAN
    4063714126004
    • A genuine portrait-format shutter release, and the MB-D60 named as its pattern
    • Five Nikon bodies listed individually, with both EN-EL9 cell types
    • No tripod thread described, on a grip that occupies the camera’s own

    Best for: A Nikon D40 through D5000 shot in portrait format for hours — weddings, portraits — where the wrist should stay straight.

    ≈ £42 / 38 €
    Check price on Amazon

All teleconverters