I've left discussing the Panasonic G6 and Focus Peaking until now. I've been trying for a while to get a Metabones Nikon G > m4/3 Speed Booster / Adapter and it finally arrived today. If you don't know what this remarkable piece of kit does, it does four things:-
- Provides an adapter for using legacy / manual focus / non-brand lenses on mirrorless cameras.
- Gives a 0.71 magnification to those lenses.
- Provides an aperture ring for lenses that don't have them (i.e. in this case Nikon G)
- Gives an extra stop of light gathering (i.e. an f/1.8 lens has the light gathering properties of an f/1.2)
So quite a lot. But does it work? Or is it just another of those cheap wide-angle adapters? Well yes it does work, but with some provisos.
- The adapter for m4/3 works with 35mm lenses. On APS-C lenses there is some serious vignetting.
- There is some added distortion.
- Corners are not quite so sharp and any CA / fringing in the lens is somewhat exaggerated.
However having just run a whole series of tests, my initial impression is that this is a very impressive adapter. The 'widening' of lenses works very well on the two Nikon G 35mm lenses I still have (28mm and 50mm f/1.8 G lenses,) and it certainly does give that extra stop of light. Below are some examples of what it does. All shot at ISO 160 and wide open (an equivalent of f/1.2 on the Nikons and f/1 on the Sigma 30mm f/1.4 I have) The ones with the obvious vignetting are from the Sigma. (The bottom four)
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