STEELSRING NK-F to GFX Auto Focus Adapter Review

Dylan Goldby posted his review of the STEELSRING NK-F to GFX Auto Focus Adapter and it is surprisingly positive considering how difficult Nikon AF adapters have been to create. Below is a summary of the above video and there is a more lengthy review here:

  • Focusing accurately at f/1.4 on the gfx isn’t easy to do with manual focus so adapters like these are great
  • Dylan missed AF even if it was just to get them close and then fine-tune the focus
  • Dylan tried multiple adapters looking for this ability
  • Nikon G and E type lenses on Nikon F Mount will work with this adapter since they have focus motors inside
  • Steelsring build quality is about what you would expect for the price point
  • It feels like it was machined well, but wished mounting to the GFX body sounded a bit smoother, but the Nikon mount sounds normal
  • Dylan isn’t worried about it damaging the mount though
  • The adapter has an aperture for G type lenses and you can set it to auto for E type lenses and then use the body to control the lens
  • The aperture ring could have been a little better implemented since the adapter doesn’t tell the camera how much it stops down
  • AF speed is very good considering it is a system interpreting other peoples lenses
  • The main limitation of AF seems to be how much glass you have to move
  • You will see CDAF wobble on the GFX
  • Doesn’t support GFX100 PDAF and not sure if it is possible
  • All GFX cameras will focus the same with this adapter
  • You won’t be tracking sports at this point
  • If you’re expecting Nikon speed AF then you probably want to skip this
  • If you’re expecting GFX focus speeds than you might want this adapter
  • Some of the Nikon glass will vignette, but you can use 35mm crop mode
  • Sharpness isn’t always there wide open since many Nikon lenses weren’t designed for this kind of resolution

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