This means that for example the fuji xf35 f1.4 in terms of light with the fuji will be quicalent to the Sony f1.8/f2.0. It does not seem to be the lens but the camera doing this.
So while you shoot iso 6400 on the Sony its more like iso 3200-4200 on the fuji. This needs to be taken into account when comparing.
My Pentax k-5 was about one full stop more sensitive at iso 3200 and up vs fuji.
This means the high iso performance of the fuji while not bad its not as good as it first seems and its in line with other current apsc. You still get a benefit for not having the AA.
You still get shallower DOF of say the xf35 at f1.4 but with the camera in terms of exposure it operates like an f1.8-f2.0 vs some other cameras.
Could it be each fuji lens has a T factor of 1/2 a
Stop to a stop darker? That's also possible but seems unlikely. One way to check that would be to use the same lens on the xe1 and another camera that is not fuji branded with an adapter.
On the Sony DSLT's and using the LA-EA4 adapter there is around 1/2 stop more exposure needed to get the same result as cameras without a fixed mirror. The Fuji sensor array has more green pixels and I have no expertise here, but it may be the case that this different configuration needs more light. These extra green pixels might explain the green foliage smearing as well, but again I'm guessing.
Whatever the cause it seems that Fuji cameras may be up to a stop 'slower' than Bayer sensor cameras in certain situations. As you stated before the implications of this are that these cameras aren't as good at high ISO's as people imagine, since the files need to be lightened in post production to achieve the same results as other brands. If so that makes them less useful than they would seem.
I don't think its that the fuji sensor needs more light. I think its that fuji calibrated their sensor to underexpose perhaps having to deal with their dr calculations.
There's no particular reason why xtrans would need more
Light as xtrans is just a different color filter array.
Whatever the reason, this gives the a6000 a significant advantage in light gathering and means that higher shutter speeds / narrower apertures / lower ISO settings can be selected to achieve the same result as the other cameras. This has all sorts of implications for noise performance and image quality and gives the a6000 a real advantage.
They are not the same thing one has to do with innate properties the other with what fuji decided to do to make their iso scale and shift the dr window of they did.
ISO settings in effect are only a guide anyway and they are often not that accurate. I've just done another post on this and for that I've tried four cameras with shutter speed and aperture set manually. Again the results show the Fuji jpgs. to be darker with a lower shutter speed. I agree that this could be the sensor requires more light or that this is something Fuji are in-camera processing.
But the result is still the same. Fuji X cameras require more light to achieve a satisfactory result. And for some reason the camera? / sensor? is either less efficient at getting enough light onto the sensor and to process the image 'correctly' or Fuji are 'software interfering' with this.
I've now tried three different lenses on two different cameras and the results are pretty much the same. I suspect that all we are going to come up with are theories here, since I doubt Fuji will shed any light on this. Plus since DxO have never tested a Fuji X camera, there's no help there either.
It makes for an interesting discussion however and certainly helps me make up my mind as to what cameras to keep or sell.
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