Hi,
Mirrorless cameras use the sensor for focusing. That eliminates a major source of focusing errors. A correctly implemented AF-system on a mirrorless camera would provide exact focus in the point of focus.
What can be a problem with mirror less is focus shift, when stopping down. Jim Kasson's experiments with different cameras indicate that focus shift is a
significant serious problem, but also that at least some mirror less solutions handle it well.
What also matters is that the new lenses for both the GFX and the X1D seem to be seriously good. Regarding the GFX, I have seen a lot of testing from Jim Kasson. Regarding the X1D, Hasselblad is publishing MTF data for their lenses and the MTF data I have seen on the X-lenses lenses is seriously good.
Phase One could send one of their cameras to Jim Kasson for half a year or so... Jim is not a tester, but he is quite passionate about finding out things.
Best regards
Erik
I didn't say SLR's were irrelevant. I do think mirrorless cameras are what is relevant right now and probably increasingly so. But you make some interesting points and in time we shall see.
I am one of those people who shot Mamiya RZ, Fuji GX-680, 4x5 an 10x8 in the film days for the reasons you mention. Big cameras are necessary when they are the only thing that gives you the results you need. I'm also someone who has been renting the XF100 extensively this last year while testing it and waiting to make a decision on replacing my 160. The back and sensor is incredible. I think the camera is good too but it's enormous and there are other alternatives to consider now. If you consider that the camera needs only to be as big as it needs to be then that puts it in to perspective. It's not so much about "fitting it in your pocket" but other things such as flying with it on airplanes.