Third-party lens

Kenko Teleplus HD AF 2X DGX

Teleconverter • Digital era

Specification

Production details
Announced:<No data>
Production status: In production
Original name:Kenko TELEPLUS HD C-AF 2X DGX
Kenko TELEPLUS HD N-AF 2X DGX
System:-
Optical design
Magnification factor:2x
Maximum format:35mm full frame
Mount:Canon EF
Nikon F
Lens construction:5 elements - 3 groups
Physical characteristics
Weight:171g (Nikon F)
Maximum diameter x Length:⌀68×36mm (Nikon F)
Weather sealing:-
Fluorine coating:-

*) Source of data: Manufacturer's technical data.

Manufacturer description #1

Kenko TELEPLUS HD 2x DGX is a teleconverter designed to make images more impressive by turning your master lens into a tele lens and capturing the object more close. By installing it between the lens and the camera body, Kenko TELEPLUS HD 2x DGX increases the effective focal length of your lens by 2x.

Precisely made in Japan and compatible with a wide range of genuine cameras and lenses, it is particularly helpful for those professional photographers as well as amateurs who may need the equivalent of a tele lens but feel no reason to purchase a new expensive one due to low frequency of use.

An optional accessory to bring your photos on a new level of creativity in the most convenient way.

Note: Kenko TELEPLUS HD DGX teleconverters are compatible with only proprietary lenses (Nikon and Canon) and Tokina lenses (except Tokina AT-X 70-200 F4 FX VCM-S, AT-X M100 AF PRO D and opera 50mm F1.4 FF Nikon mount). Other manufacturers' lens and camera models, or side-party adapters, are not supported.

Kenko TELEPLUS HD 2x DGX teleconverter is a high precision manufactured optical device to be installed between the camera body and the master lens. Its purpose is to multiply the focal length of the lens according to its multiplication factor, changing your lens into a tele lens, with minimum loss of resolution and sharpness of the image.

For example, a 2x teleconverter can turn a 70-200mm lens into a 140-400mm lens.

HD is a standard series of tele converters designed to fit high resolution DSLR camera and lenses and to perform best results when used with lenses whose focal length is from 50mm or more.

Main features

Kenko TELEPLUS HD 2x DGX teleconverter provides:

  • Complete communication and signal integrity between the lens and camera body for secure autofocus, aperture and data calculation functions.
  • Ability to convert and record EXIF data within the image. Teleconverter can in fact record the equivalent aperture and focal length of the lens according to the multiplication factor of the converter.
  • High quality optical elements, as well as other parts, due to its precise manufacturing in Japan.
  • Compatibility with a wider range of Nikon and Canon lenses, marking it as the most versatile accessory among those usually chosen by photographers.

Practical advantages

Kenko TELEPLUS HD 2x DGX can dramatically change your photos by making the object appear larger in the image and yet maintaining its high resolution and quality. This result can be achieved by simply using this lightweight and compact teleconverter even if you do not have or cannot afford a good and powerful supertele lens.

Precautions

  • Turn off optical correction functions, Vibration Reduction (VR) or Image Stabilizer (IS) functions, focus aid assistance and AF micro adjustment functions before using Kenko TELEPLUS teleconverter.
  • Proper work and accuracy of AF mode only when the lens has a resulting aperture* of f/5.6 or faster. If the resulting aperture is greater than f/5.6 manual focus is strongly recommended.

* resulting aperture = wide open aperture value of the master lens x magnification of the lens converter.

Manufacturer description #2

Placed between the camera body and lens, a teleconverter contains a set of optics that will effectively increase the focal length of any lens with which it is used on. The KENKO TELEPLUSHD 1.4X / 2.0X DGX converter has the effect of multiplying the focal length of your lens by 1.4x / 2.0x, turning a 300mm lens into an equivalent 420mm lens for the 1.4x and 600mm for the 2.0x.

Both the HD 1.4X and 2.0X DGX converters have genuine Gate Array IC (Integrated Circuitry). This means the converter’s unique circuitry maintains signal integrity between the camera body and lens. The 3~5-element design made with high quality multi-coated optical glass supplied by Hoya Corporation, the world’s largest manufacturer of optical glass.

Full AF operation with the TELEPLUS HD 2.0X /1.4X is possible using a camera lens with an open aperture of F4 or brighter while the 2.0X DGX would require an open aperture of F2.8 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera’s AF sensors properly. (Manual focusing may be necessary when using lenses with smaller open f-stop values than that given above.)

The TELEPLUS DGX converters have updated circuitry to record exif data more accurately. In the exif exposure data (meta-data recorded with a digital picture) TELEPLUS DGX converters record the equivalent aperture and focal length of the lens setting plus teleconverter. Optically and mechanically they are identical to the prior high-quality TELEPLUS DG converters.

Lens performance has been improved dramatically as compared to the MC4 and MC7 models. The improvement in resolution is especially marked, 150% for 1.4X and 180% for 2X respectively in comparison to the current model.

Compatible lenses (8)

Tokina AT-X Pro AF SD 11-16mm F/2.8 [IF] DX II ⌀77APS-CPro 2012 
Tokina AT-X Pro AF SD 11-20mm F/2.8 [IF] DX ⌀82APS-CPro 2015 
Tokina AT-X Pro AF SD 12-24mm F/4 [IF] DX II ⌀77APS-CPro 2009 
Tokina AT-X Pro AF SD 12-28mm F/4 [IF] DX ⌀77APS-CPro 2013 
Tokina AT-X Pro AF SD 14-20mm F/2 [IF] DX ⌀82APS-CPro 2015 
Tokina AT-X Pro AF SD 16-28mm F/2.8 [IF]Pro 2010 
Tokina AT-X Pro AF SD 17-35mm F/4 [IF] ⌀82Pro 2011 
Tokina AT-X Pro AF SD 24-70mm F/2.8 [IF] ⌀82Pro 2015 
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35mm full frame

43.27 24 36
  • Dimensions: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm

Travellers' choice

Note

Among autofocus lenses designed for 35mm full-frame mirrorless cameras only. Speed of standard and telephoto lenses is taken into account.

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Cannot compare the lens to itself.

Image stabilizer

A technology used for reducing or even eliminating the effects of camera shake. Gyro sensors inside the lens detect camera shake and pass the data to a microcomputer. Then an image stabilization group of elements controlled by the microcomputer moves inside the lens and compensates camera shake in order to keep the image static on the imaging sensor or film.

The technology allows to increase the shutter speed by several stops and shoot handheld in such lighting conditions and at such focal lengths where without image stabilizer you have to use tripod, decrease the shutter speed and/or increase the ISO setting which can lead to blurry and noisy images.

Original name

Lens name as indicated on the lens barrel (usually on the front ring). With lenses from film era, may vary slightly from batch to batch.

Format

Format refers to the shape and size of film or image sensor.

35mm is the common name of the 36x24mm film format or image sensor format. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43mm. The name originates with the total width of the 135 film which was the primary medium of the format prior to the invention of the full frame digital SLR. Historically the 35mm format was sometimes called small format to distinguish it from the medium and large formats.

APS-C is an image sensor format approximately equivalent in size to the film negatives of 25.1x16.7mm with an aspect ratio of 3:2.

Medium format is a film format or image sensor format larger than 36x24mm (35mm) but smaller than 4x5in (large format).

Angle of view

Angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view.

As the focal length changes, the angle of view also changes. The shorter the focal length (eg 18mm), the wider the angle of view. Conversely, the longer the focal length (eg 55mm), the smaller the angle of view.

A camera's angle of view depends not only on the lens, but also on the sensor. Imaging sensors are sometimes smaller than 35mm film frame, and this causes the lens to have a narrower angle of view than with 35mm film, by a certain factor for each sensor (called the crop factor).

This website does not use the angles of view provided by lens manufacturers, but calculates them automatically by the following formula: 114.6 * arctan (21.622 / CF * FL),

where:

CF – crop-factor of a sensor,
FL – focal length of a lens.

Mount

A lens mount is an interface — mechanical and often also electrical — between a camera body and a lens.

A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock type. Modern camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body, unlike screw-threaded mounts.

Lens mounts of competing manufacturers (Canon, Nikon, Pentax, Sony etc.) are always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance can also be different.

The flange focal distance (FFD) is the distance from the mechanical rear end surface of the lens mount to the focal plane.

Lens construction

Lens construction – a specific arrangement of elements and groups that make up the optical design, including type and size of elements, type of used materials etc.

Element - an individual piece of glass which makes up one component of a photographic lens. Photographic lenses are nearly always built up of multiple such elements.

Group – a cemented together pieces of glass which form a single unit or an individual piece of glass. The advantage is that there is no glass-air surfaces between cemented together pieces of glass, which reduces reflections.

Focal length

The focal length is the factor that determines the size of the image reproduced on the focal plane, picture angle which covers the area of the subject to be photographed, depth of field, etc.

Speed

The largest opening or stop at which a lens can be used is referred to as the speed of the lens. The larger the maximum aperture is, the faster the lens is considered to be. Lenses that offer a large maximum aperture are commonly referred to as fast lenses, and lenses with smaller maximum aperture are regarded as slow.

In low-light situations, having a wider maximum aperture means that you can shoot at a faster shutter speed or work at a lower ISO, or both.

Closest focusing distance

The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.

Closest working distance

The distance from the front edge of the lens to the subject at the maximum magnification.

Magnification ratio

Determines how large the subject will appear in the final image. For example, a magnification ratio of 1:1 means that the image of the subject formed on the film or sensor will be the same size as the subject in real life. For this reason, a 1:1 ratio is often called "life-size".

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Electronic manual focus override is performed in the following way: half-press the shutter button, wait until the camera has finished the autofocusing and then focus manually without releasing the shutter button using the focusing ring.

Electromagnetic diaphragm control system

Provides highly accurate diaphragm control and stable auto exposure performance during continuous shooting.

Manual diaphragm

The diaphragm must be stopped down manually by rotating the detent aperture ring.

Preset diaphragm

The lens has two rings, one is for pre-setting, while the other is for normal diaphragm adjustment. The first ring must be set at the desired aperture, the second ring then should be fully opened for focusing, and turned back for stop down to the pre-set value.

Semi-automatic diaphragm

The lens features spring mechanism in the diaphragm, triggered by the shutter release, which stops down the diaphragm to the pre-set value. The spring needs to be reset manually after each exposure to re-open diaphragm to its maximum value.

Automatic diaphragm

The camera automatically closes the diaphragm down during the shutter operation. On completion of the exposure, the diaphragm re-opens to its maximum value.

Fixed diaphragm

The aperture setting is fixed at F/ on this lens, and cannot be adjusted.

Number of blades

As a general rule, the more blades that are used to create the aperture opening in the lens, the rounder the out-of-focus highlights will be.

Some lenses are designed with curved diaphragm blades, so the roundness of the aperture comes not from the number of blades, but from their shape. However, the fewer blades the diaphragm has, the more difficult it is to form a circle, regardless of rounded edges.

At maximum aperture, the opening will be circular regardless of the number of blades.

Weight

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

Maximum diameter x Length

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

For lenses with collapsible design, the length is indicated for the working (retracted) state.

Weather sealing

A rubber material which is inserted in between each externally exposed part (manual focus and zoom rings, buttons, switch panels etc.) to ensure it is properly sealed against dust and moisture.

Lenses that accept front mounted filters typically do not have gaskets behind the filter mount. It is recommended to use a filter for complete weather resistance when desired.

Fluorine coating

Helps keep lenses clean by reducing the possibility of dust and dirt adhering to the lens and by facilitating cleaning should the need arise. Applied to the outer surface of the front and/or rear lens elements over multi-coatings.

Filters

Lens filters are accessories that can protect lenses from dirt and damage, enhance colors, minimize glare and reflections, and add creative effects to images.

Lens hood

A lens hood or lens shade is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background.

The geometry of the lens hood can vary from a plain cylindrical or conical section to a more complex shape, sometimes called a petal, tulip, or flower hood. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood.

Lens hoods are more prominent in long focus lenses because they have a smaller viewing angle than that of wide-angle lenses. For wide angle lenses, the length of the hood cannot be as long as those for telephoto lenses, as a longer hood would enter the wider field of view of the lens.

Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. In addition, lens hoods can offer some degree of physical protection for the lens due to the hood extending farther than the lens itself.

Teleconverters

Teleconverters increase the effective focal length of lenses. They also usually maintain the closest focusing distance of lenses, thus increasing the magnification significantly. A lens combined with a teleconverter is normally smaller, lighter and cheaper than a "direct" telephoto lens of the same focal length and speed.

Teleconverters are a convenient way of enhancing telephoto capability, but it comes at a cost − reduced maximum aperture. Also, since teleconverters magnify every detail in the image, they logically also magnify residual aberrations of the lens.

Lens caps

Scratched lens surfaces can spoil the definition and contrast of even the finest lenses. Lens covers are the best and most inexpensive protection available against dust, moisture and abrasion. Safeguard lens elements - both front and rear - whenever the lens is not in use.