I use this 2X teleconverter with a Nikon Z 100-400 lens f4.5-5.6 lens. This converts it to a 200-800mm f9-11 lens. At 800mm and f11 the lens isn't quite as sharp as it is at 400mm and f5.6. In good sunlight the autofocus works just as quickly as at 400mm f5.6. I don't use this teleconverter a lot because I mostly don't need this amount of reach but, when I do I think I get better results than trying to crop an image taken at 400mm.
Verified purchase: Yes | Condition: Pre-owned
Looks brand new. Very happy with purchase.
Verified purchase: Yes | Condition: Pre-owned
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