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A 2× converter, and not one lens named

Sigma 2×, SLD glass, sealed — no lens list

Three hundred and forty-nine euros for a sealed 2× converter with Special Low Dispersion glass — and five bullets that name no lens, no stop and no gram.

Sigma TC-2001 2× teleconverter with its Canon EF mount

Sigma 2×, SLD glass, sealed — no lens list

Three hundred and forty-nine euros for a sealed 2× converter with Special Low Dispersion glass — and five bullets that name no lens, no stop and no gram.

Magnification
2.0×, in the second bullet. A 300 mm becomes a 600 mm, and the maximum aperture moves two stops with it
Lenses named as compatible
NONE — and on a 2× converter that is the gap that matters most. The title gives the Canon EF mount and the five bullets give nothing: no list, no range, not even a phrase like "L-series above 135 mm". The intro above is explicit that makers publish a list rather than a mount specification because a converter protrudes, and that fitting one to an unlisted lens can mean contact with the rear element. The 169 € Viltrox on this shelf names five lenses and puts "only" in front of them
Light loss in stops
Not published. Two stops, by the arithmetic the intro above gives for every 2×: an f/2.8 lens works at f/5.6, an f/4 at f/8. The page does not mention it, and at 349 € that is a considerable omission
Autofocus limits stated
Autofocus is not mentioned at all, in any bullet — neither claimed nor qualified. On a 2× that turns f/4 into f/8 this is the specification a buyer most needs, and the page is silent
Added length
Not published. The fifth bullet says compact and light and gives no millimetres, where the 323 € OM SYSTEM publishes 15 mm
Sealing
Dust- and splash-protected, in the fourth bullet. One of three converters on this shelf to claim it
Published weight
Not published — on a bullet that calls it light. As on all six converters here
Amazon reference
B00NIHBM9U (same reference on 6 Amazon marketplaces)
EAN
0085126870546
  • Special Low Dispersion elements, named as a material rather than as a coating
  • Dust and splash protection, at the price level where this shelf starts claiming it
  • Not one compatible lens named, in five bullets, on a converter that protrudes

Best for: A buyer who has already confirmed elsewhere that their lens accepts this converter, and who wants Special Low Dispersion glass in the joint.

≈ $369 / £330 / 349 €
Check price on Amazon

Specifications

Magnification
2.0×, in the second bullet. A 300 mm becomes a 600 mm, and the maximum aperture moves two stops with it
Lenses named as compatible
NONE — and on a 2× converter that is the gap that matters most. The title gives the Canon EF mount and the five bullets give nothing: no list, no range, not even a phrase like "L-series above 135 mm". The intro above is explicit that makers publish a list rather than a mount specification because a converter protrudes, and that fitting one to an unlisted lens can mean contact with the rear element. The 169 € Viltrox on this shelf names five lenses and puts "only" in front of them
Light loss in stops
Not published. Two stops, by the arithmetic the intro above gives for every 2×: an f/2.8 lens works at f/5.6, an f/4 at f/8. The page does not mention it, and at 349 € that is a considerable omission
Autofocus limits stated
Autofocus is not mentioned at all, in any bullet — neither claimed nor qualified. On a 2× that turns f/4 into f/8 this is the specification a buyer most needs, and the page is silent
Added length
Not published. The fifth bullet says compact and light and gives no millimetres, where the 323 € OM SYSTEM publishes 15 mm
Sealing
Dust- and splash-protected, in the fourth bullet. One of three converters on this shelf to claim it
Published weight
Not published — on a bullet that calls it light. As on all six converters here
Amazon reference
B00NIHBM9U (same reference on 6 Amazon marketplaces)
EAN
0085126870546

On the listing

Five bullets. A high-quality standard teleconverter described as perfectly suited to new product lines; a magnification of the focal length by 2.0×; SLD — Special Low Dispersion — glass elements giving excellent aberration correction; dust and splash protection; and a closing bullet calling it compact and light, an easy way to extend the focal range.

Two times, and no lens named

Five bullets, and the only compatibility statement is a mount in the title. The intro above says a converter is sold with a list because it protrudes into the space behind the lens. This page sells it with a product-line compliment.

Special Low Dispersion, in the elements

A material claim rather than a coating claim, and the right one for a device that magnifies a lens’s existing colour fringing along with its image.

What two stops means at three hundred and forty-nine euros

An f/2.8 lens working at f/5.6; an f/4 at f/8. The page never says it. The 169 € Viltrox says it in its first bullet.

Autofocus, unmentioned in five bullets

Neither promised nor denied. On a converter that halves the light twice, it is the specification a buyer reads first.

Availability

Between 349 € and 350 € 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

  • 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
  • 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

Elsewhere in the camera bag

  • K&F Concept 67 mm UV filter with its green-tinted coating catching the light

    K&F CONCEPT 67 mm, Japanese glass, 18 nano layers

    Eighteen layers of nano coating on Japanese glass for 11 €, with a claim to cut chromatic aberration — and a sales-rank citation where a seventh specification would go.

    Thread size
    67 mm, in the title, and the fifth bullet says it suits all lenses with a 67 mm thread, naming Canon, Nikon, Sony, Samsung and Fuji
    Glass
    JAPANESE OPTICAL GLASS, in the second bullet, credited with first-class light transmission, improved optical clarity and colour fidelity. The same claim the 13 € PROfezzion on this shelf makes; the 9 € Amazon Basics names no glass at all
    Coating description
    EIGHTEEN LAYERS of green anti-reflective nano coating, in the third bullet — the highest count on this shelf, against twelve on the PROfezzion and two on the Hama. The same bullet claims the coating blocks ultraviolet light, raises contrast and eliminates light haze at sea or in high mountains
    Frame thickness
    NOT PUBLISHED as a figure: the fourth bullet calls it an extremely thin filter and leaves it there. The 8 € Hama publishes 3.4 mm and the 13 € PROfezzion 3 mm, so the one page here claiming thinness is the one that does not measure it
    Material
    Not named for the frame. The glass is specified and the ring is not
    Front thread provision
    Not mentioned
    Stated transmission figure
    NOT PUBLISHED — which is the odd gap on a page that counts eighteen coating layers. Layers exist to raise transmission, and the 13 € PROfezzion publishes the resulting figure at 99.5 per cent minimum
    Amazon reference
    B0C1YZBPRK (same reference on 6 Amazon marketplaces)
    EAN
    6942052514675
    • Eighteen nano layers on named Japanese optical glass, for 11 €
    • A stated effect on chromatic aberration, which no other filter here claims
    • Calls itself extremely thin and publishes no thickness

    Best for: A 67 mm standard zoom used in bright coastal or mountain light, where haze and reflections matter more than the gap to the 9 € Amazon Basics.

    ≈ $11 / £11 / 11 €
    Check price on Amazon
  • 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 €
    Check price on Amazon
  • 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

All teleconverters