Originally posted by eurostar But it's quite demanding on lenses. Are we sure any of the very few existing FF Pentax lenses actually on sale have enough QI for that sensor?
Something to keep in mind, and this sometimes flies in the face of 'conventional wisdom', but:
Regarding resolution,
all your lenses will perform better on a higher-MP sensor than they did on a lower-MP sensor.
The quality of the lens determines if they will perform a
lot better (maximizing the sensor potential) or just a
little better (leaving some resolution on the table.)
Now, when you pixel-peep, you may notice softness problems at some apertures and some parts of the frame that you didn't notice before - but that's just because the lower-MP sensor completely hid that information before. Those lenses didn't 'do better' with the lower-MP sensor, the lower-MP sensor just hid the problems better. It's important to remember that the MTF charts you see on photozone, etc are
system MTF scores; lens + sensor. You keep the lens the same, but bump up the sensor, and your system MTF score goes up.
What this means is that you will never see worse resolution at the same display sizes with the higher-MP sensor, and you will
usually see better resolution, even after a downsample, even taking diffraction into account.
You shouldn't fear the MP! (and your lenses shouldn't either.
)
(Having said the above, I fully expect Pentax to update some existing lenses, because they will be able to re-sell them to existing users - and they will be able to make the lenses perform better.)
.