Chez Nikon la qualité est toujours la. Ce n'est pas bon marché, mais c'est la seule option valable

Lo uso con un Lente AF-S 200-500 mm f/5.6 ED VR y el Adaptador FTZ en una Nikon Z6 y el resultado ha sido mejor de lo que esperaba

I was a bit skeptical about buying this especially because they say I will lose some f-stops when using it. Well - turned out that this is a very transparent process for the user and I will explain you why.Using this teleconverter with a 70-200mm f/2.8, my camera automatically adjusted the maximum aperture to f/5.6. The exif data shows I was using a 70-200mm lens at 400m! (which is somehow correct, letting me know that the camera was also using the tele at the moment of the picture.The quality of the pictures is decreasing - fringing artefacts are noted on high contrast areas but in rest is quite ok.The bokeh takes interesting shapes with this teleconvertor - I couldn't decide if I like it or not. But interesting.Far subjects in the summer will look also interesting because the tele will accentuate the steamy heat from the road or the sand at the beach.I was also fearing the (camera+tele+large lens) won't be a very solid setup... but the Nikon did a great job - you could hold only the body of the camera without having a shaking lens.Basically, I would say that this add-on will transform your PRO lens into a normal one from quality point of view.But overall - I like it because even if the image quality is not perfect, it gives me 2x of optical zoom and in normal lighting conditions, it produces sharp images with good contrast.Mine is Made in Japan - I hope you get the same... ;)

Works surprising well. I have 4 compatible lenses which all autofocus with this converter even on older bodies. The lenses I use it with are 105 f2.8 macro which does autofocus even though Nikon compatibility chart say it does not (not tested for macro work). It also works well with my 70-200 f4, 300 f2.8 VRII and even under indoor lighting with my recently procured 300 f4 PF. I already owned the 1.4 TC II and 1.7 TCII converters and certainly with the f4 lenses autofocus does noticeably slow down with each subsequent size of converter. What surprised me was that even my old bodies D50, D300 and D700 still work with my f4 lenses plus this 2X converter even though their AF is only rated to f5.6 and the D500 was only slightly faster in its ability to focus. While there is some slight trade of in sharpness I find the combination of 300 f4 PF and this converter gives a light and very useable equivalent 600 f8 which can be handheld in good light using fast shutter speeds on my D500 with increased ISO. Works even better with the 300 f2.8 but becoming heavy and really needs support.

Superb quality...works so well with my 70-200 2.8 👍