Used with a great lens, of course it's ultrasharp; sharper potentially than the air through which we shoot. In practice, though, teleconverters have disadvantages, including the effect they have on your lens’s maximum aperture and often on the overall optical quality of your photos.

Size: The diameter of both TCs is 72mm (2.8 in.). The length is 19mm (0.7in.) resp. 33mm for the TC-1.4x and TC-2.0x – not counting the protrusion at the front which extends into the mounted lens. The F TCs are 64mm in diameter and 25mm resp. 46mm in length. [0] Why you can trust Digital Camera World Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out how we test. If you're splitting pixels, the TC-17E gives sharper results at the largest apertures. If you need 2x, the TC-20E is your converter. This reduction in maximum aperture could affect your camera’s autofocus system, since some older systems won’t work with apertures lower than f/8; you may have to resort to manual focus.Many modern autofocus systems, however, especially on the latest mirrorless cameras, now go way beyond that, so it may no longer be an issue.

Here’s another example, this time with a lens that has a bit more chromatic aberration in the first place – the Nikon Z 100-400mm f/4.5-5.6 VR S. In the chart below, the “560mm” entry refers to the 1.4x TC, and the “800mm” entry refers to the 2.0x TC: Desert Floor as Seen from Six Miles (10 km) Away, 2:22 PM, Thursday, 10 November 2022. Nikon Z7II, Nikon Z 400mm f/4.5 VR with Z TC 1.4× teleconverter (making this a 560mm lens) wide-open at f/6.3 hand-held at 1/ 640 at Auto ISO 64 ( LV15.3), Radiant Photo Software to cut through the haze. bigger or full resolution. This time, the sharpness results are clearly worse, as expected. The results are still usable, but even the best-case scenario with the 1.4x TC is essentially “f/16-level sharpness”– fine in many cases, but nothing groundbreaking. Meanwhile, at 800mm with the 2.0x teleconverter, the results are acceptable in a pinch. But if I shot at 800mm constantly, I would definitely want to add the Nikon Z 800mm f/6.3 to my bag. Nikon made about 20,000 of the original TC-20E, and as of 2008, has made about 15,000 of the newer TC-20E II. Once again, the teleconverters are adding about 0.5 pixels of chromatic aberration to our lab measurements, with the 2.0x TC looking a bit worse than the 1.4x TC. Vignetting

Nikon's first AF 2x teleconverter was called the TC-20E. It was marked " AF-I" for the only kind of lenses with which it worked when it was introduced. As Nikon introduced AF-S lenses, these converters worked perfectly, but innocent people were confused as to why it said AF-I instead of AF-S. Compared to the 70mm test that I showed you a moment ago, the biggest difference at 200mm is that the corners are weaker with both TCs. You can trace that result directly to the bare lens at 200mm, where it has worse midframes and corners than it does at 70mm. Teleconverters tend to exaggerate issues that are already present in a lens, and this is no exception. 3. Nikon Z 100-400mm f/4.5-5.6 VR S at 400mm Nikon introduced two new teleconverters with its professional Z 70-200mm f2.8 VR S telephoto zoom: The Z TC-1.4x and TC-2.0x teleconverters are designed for Nikon’s Z-series mirrorless cameras and corrected for full-frame sensors. Teleconverters are mounted between the lens and the camera body and magnify the image by 1.4x or 2.0x thus effectively increasing the focal length of each lens by the same amount. Unfortunately lenses have to be designed to work with teleconverters and currently the Nikon Z 70-200mm f2.8 VR S is the only lens which can be used with Nikon’s new TC-1.4x and TC-2.0x. But Nikon will certainly add more lenses to their Z line-up in the future which can use teleconverters.I get perfectly sharp shots almost all the time at 1/60 with VR, but need at least 1/1,000 to get the same results without VR. People worry waaaaay too much about lens sharpness. It's not 1968 anymore when lenses often weren't that sharp and there could be significant differences among them; ever since about 2010 all new lenses are all pretty much equally fantastic. Detailed specifications for the lens, along with MTF charts and other useful data can be found in our lens database. NIKON D3S + 300mm f/2.8 @ 600mm, ISO 560, 1/500, f/5.6 Thus the many small regions of localized softness you may see are not caused by the lens, but by the heat shimmer. The lens is accurately recording it.

zoom lenses are too slow. Teleconverters are most useful if you already have a fast (f/2.8) lens to begin with. I wouldn't use this with the Nikon Z 70-200mm f/2.8 VR, which becomes a 140-400mm f/5.6. Instead I use the Nikon Z 100-400mm f/4.5-5.6 VR all the time. This way I can get to 400mm simply by twisting the zoom ring, no converter needed, and if I need longer than 400mm, then and only then will I use this converter and get to 800mm. I haven't used 70-200mm f/2.8 lenses for a couple of decades now for this practical reason. Both converters are identical except for the name and trim. Both work with both AF-I and AF-S lenses. Filter-thread: no need to buy new ones. The same filters still can be used at the front of the lens. Which in case of the Nikon Z 70-200mm f2.8 VR S are 77mm diameter. [+]For instance, the 70-300mm AF-S VR, 80-200mm f/2.8 AF-D and 80-400mm VR lenses can't even be mounted to this converter. Nikon designed them this way.