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When you use a teleconverter, start by checking that your exact camera, lens and converter are compatible. Then choose a shutter speed for your subject, account for the converter’s light loss, and adjust ISO or shutter speed to expose the image. There is no single best setting: the right balance depends on subject motion, available light, stabilization and how reliably your combination focuses.
Check compatibility before mounting the converter
Teleconverters fit between a lens and camera to increase effective focal length. Compatibility is specific to the equipment: a lens that physically mounts is not necessarily approved for use. Check the converter maker’s compatibility chart and your camera and lens manuals for the exact combination, including autofocus and exposure limitations.
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Nikon warns that unlisted NIKKOR lenses must not be attached to its converters because a lens’s rear element could contact and damage the converter. Use Nikon’s AF-S Teleconverter Compatibility chart for those combinations; do not infer compatibility from another lens in the same series. Other manufacturers have their own lists and tools, such as the one linked from Sony’s FE 2x Teleconverter SEL20TC page.
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A converter can preserve a lens’s close-focusing distance and save you from carrying a longer lens, but it can also reduce sharpness and may introduce visible defects such as vignetting. Nikon describes light loss and a possible decrease in sharpness as teleconverter trade-offs in its Using Teleconverters guide.
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- 5X telephoto use only: Only for phones with a 5x optical telephoto lens; compatible with iPhone 18 Pro Max 18Pro 17 Samsung Galaxy S26 Ultra S25 Xiaomi 15 Ultra Vivo X200 Ultra, and more; not for main or ultra wide cameras; telephoto zoom varies by model
- Real 15x lossless optical zoom: Extends phone telephoto lens from 5x (120mm equivalent) to 15x (360mm equivalent) without digital cropping—retaining clarity and fine details for shooting distant subjects like wildlife, sports, concerts, and portraits
- Multicoated optical system: 12 elements in 6 groups HD optical glass and multilayer coatings minimize glare and distortion while enhancing image sharpness and detail—even at high zoom levels
- 17mm mount + 37mm filter thread: Equipped with a 17mm lens mount for NEEWER phone cages and phone cases; the 37mm front thread supports ND, CPL, and other content creator essential and influencer must have photography filter accessories
- Use with tripod & phone cage: Use a tripod to reduce shake and blur; secure lens with NEEWER 17mm thread cage or case; set max zoom to activate telephoto lens; compatible with iPhone, disable Macro Control and cover extra lenses to stop auto switching
Account for the effective aperture and light loss
A teleconverter magnifies the image and reduces the lens’s effective maximum aperture. Nikon gives these light-loss figures for its converter magnifications:
| Converter magnification | Light lost | Example of the exposure effect |
|---|---|---|
| 1.4x | 1 stop | A lens wide open at f/4 has an effective maximum aperture of about f/5.6. |
| 1.7x | 1.5 stops | The effective maximum aperture is about 1.5 stops smaller than the lens’s stated maximum. |
| 2x | 2 stops | A lens wide open at f/4 has an effective maximum aperture of about f/8. |
The stop-loss figures are Nikon’s guidance in its teleconverter guide; the f/4 examples illustrate the exposure calculation rather than a guarantee about a particular lens. In a Sony example, the company says its 2x FE converter changes f/2.8 to an effective f/5.6, and that higher ISO or a slower shutter may be needed to maintain exposure (Sony FE 2x Teleconverter SEL20TC).
Your camera may display the effective aperture when the body and converter communicate that information, but reporting can differ across systems and older combinations. Check the display on your own camera instead of assuming it will show the same value as another setup.
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- The 2X Teleconverter can make the focal length of all the Canon EF lenses increased to 2 times, Built-in 4 groups, 7 pcs optics, and the exposure factor enlarge approx 4. (equals to 2 aperture).
- Compatible for Canon EF Mount Lens.[Notice:It only compatible with fixed focal length L-series lenses 100mm and over, as well as the EF 70-200mm f/2.8L, EF 70-200mm f/2.8L IS, EF 70-200mm f/4L, and EF 100-400mm f/4.5-5.6L.]
- Support lens Auto Focus function.Outstanding image quality thanks to new optical design and improved AF performance. The focus speed is really fast and can track the subject, and lock the subject flexibly and accurately.
- Lens coatings are optimized to minimize ghosting and flare. With the aperture adjustment lever on the adapter, you can adjust the aperture fast.
- With an upgraded USB firmware interface, it supports USB firmware upgrading, and through subsequent upgrades, the adapter can improve its function, and fix bugs.
Choose shutter speed for the subject first
Decide how much motion you can tolerate before balancing exposure. A perched bird, a moving bird and a field-sport athlete call for different shutter speeds; a shutter slow enough for a static subject may record a moving one as blur. A longer effective focal length can also make camera shake more visible.
- For moving subjects: prioritize a shutter speed that freezes the action. If the image is underexposed, raising ISO is usually preferable to slowing the shutter when motion blur would spoil the shot.
- For still subjects: a slower shutter may help preserve a lower ISO, particularly with stable support. Check the result at magnification, since stabilization does not freeze subject movement.
- For either: use a tripod, monopod or other support when it suits the situation, and take a test frame to check for shake and focus error.
There is no universal shutter-speed threshold: the necessary speed depends on subject movement, focal length, technique, stabilization and how much blur is acceptable.
Recover exposure without sacrificing the shot
Once the shutter speed suits the subject, use the camera meter and review the histogram or exposure warning to assess brightness. If the converter’s light loss leaves the image too dark, raise ISO or, if the subject allows it, slow the shutter. These are trade-offs: higher ISO can make noise more visible, while a slower shutter raises the risk of blur.
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- Compatible with select Nikon NIKKOR Z long telephoto lenses.
- Increases the native reach of compatible lenses by 40%—without any loss of resolution and with outstanding image quality.
- Retains all AF functionality and speed, VR capabilities and minimum focusing distance, with only 1 stop of light loss.
- Can use every focus point of your Z series camera's sensor all the way down to f/11, unprecedented for teleconverters.
- Maintains the close focusing capability of NIKKOR Z lenses while enlarging the reproduction ratio by 1.4x. Durable and dust and drip resistant.
- Set the aperture: choose within the lens-and-converter combination’s supported range. Remember that the maximum available aperture is effectively smaller after adding the converter.
- Set shutter speed: make it fast enough for the subject’s movement and your ability to hold or support the camera steady.
- Adjust ISO: raise it as needed to reach a usable exposure without compromising the shutter speed the scene requires.
- Review and correct: inspect the histogram and image, then adjust exposure compensation or the relevant manual-exposure setting for the light and subject.
A correct meter reading does not guarantee a sharp photograph: exposure and focus are separate checks. If the subject is correctly exposed but blurred, determine whether the cause is subject motion, camera shake or missed focus before changing settings.
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Because the effective maximum aperture is smaller, a converter can affect whether autofocus works and how quickly or accurately it locks. Limits vary by camera, lens and converter; do not apply one manufacturer’s aperture limit to another system. Consult the specific compatibility chart and try autofocus on the subject and in the lighting you expect to shoot.
Nikon’s F-mount chart lists autofocus limitations by equipment combination. For its Z-series bodies and supported Z teleconverters, Nikon says every AF point can be used down to f/11; that is a Nikon Z-system claim, not a general teleconverter rule. Nikon also notes that AF speed and accuracy on Z cameras can vary with the subject and shooting situation (compatibility chart; Z-series teleconverter guidance).
Rank #4
- 2x telephoto lens converter: For smartphones with a built in 5x telephoto camera, this converter doubles optical zoom from 5x (120 mm equivalent) to 10x (240 mm equivalent) for distant shooting without digital cropping or image loss
- For 5X telephoto cameras only: Not for main camera; cell phone accessories compatible with Vivo X200 Ultra Xiaomi 15 Ultra Samsung Galaxy S26 S25 Ultra Android iPhone 18 Pro Max 18 Pro 17 16 Pro/Pro Max; select 5X before use if optical zoom is below 5X
- Compact and lightweight: Compared to standard external zoom lenses, this 2x converter is shorter and lighter; it features a 17mm thread for 17mm threaded phone cages, cases, and lens clips; content creator essential photography and filming accessories
- Multicoated optical glass: 7 elements in 5 groups of HD optical glass and multiple nanocoatings reduce glare and distortion, resist water, fingerprints, and scratches, and ensure excellent light transmission; a cleaning cloth is included
- Important note: Different phone brands may require different zoom levels to activate the telephoto lens; compatible with iPhone, apply the included stickers to cover the wide angle lens to prevent lens switching caused by light sensor interference
If autofocus is unavailable or unreliable with an approved combination, try manual focus and confirm focus carefully using your camera’s available magnification or focus aids. Do not treat manual focus as a workaround for an unlisted, physically unsafe combination.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test sharpness before relying on the setup
Even a compatible converter may not deliver the same sharpness as the lens alone or a dedicated longer lens. For an informative comparison, photograph the same subject with and without the converter at similar framing, using careful focus and stable support. Compare details at the intended aperture and viewing size; also check for vignetting or other visible defects.
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- Use the support and stabilization options appropriate to your camera and shooting conditions.
- When light is limited, weigh the converter’s added reach against the higher ISO or slower shutter needed to expose the image.
Manufacturer claims about retained performance apply to supported combinations, not every lens and camera. For example, Nikon says its TC-14E III retains image quality, autofocus accuracy, metering and VR stabilization with compatible AF-S NIKKOR lenses. Check the chart for your exact lens and body before considering that model.
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- ✓【PRODUCT SUPPORT, 3-Year Waranty】— We are committed to providing our customers with an exceptional experience, if you encounter any issues during use, please feel free to let us help you.
- ✓【 Compatible List】 — Only Compatible With Sony FE SEL70-200G2/ FE SEL70-200GM2/ FE SEL70-200GM/ FE SEL100-400GM/ FE SEL200-600G/ FE SEL400-800G/ FE SEL300F28GM/ FE SEL400F28GM/ FE SEL600F40GM/Viltrox 135mm F1.8 LAB FE
- ✓【Extends focal length by 2x】 — The 2.0X teleconverter is a lens accessory that can be mounted between the camera and lens to increase the focal length by up to 2x, making it particularly suitable for users who want to use telephoto lenses for wildlife, sports, etc.
- ✓【Double the focal length】 — The 2.0X teleconverter extends the telephoto focal length without increasing the number of lenses, achieving a balance between increased focal length and high-quality images.
- ✓【Wide compatibility, comparable to original teleconverters】 — The Viltrox 2.0X teleconverter complements the original lens, providing 2.0 times the focal length. It maintains overall image quality and lens autofocus functionality and features a dust- and splash-proof design for reliability in outdoor photography.
Choose 1.4x or 2x based on the trade-off
A stronger converter gives more reach but also costs more light, and compatibility, autofocus and sharpness can differ by combination. Compare the options you are considering against your actual lens and shooting conditions:
| What to compare | 1.4x converter | 2x converter |
|---|---|---|
| Added reach | Less magnification than 2x | More magnification than 1.4x |
| Light loss in Nikon’s guidance | 1 stop | 2 stops |
| Autofocus | Check the exact camera-lens-converter combination | Check the exact camera-lens-converter combination |
| Sharpness | Test the actual combination at the aperture and distance you plan to use | Test the actual combination at the aperture and distance you plan to use |
These stop figures are from Nikon’s manufacturer guidance; the compatibility and image-quality checks are not interchangeable between systems. A crop or a longer lens may be a better fit if the converter’s light loss, focus behavior or image quality does not suit the shot.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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