Originally posted by Kunzite To my knowledge, Pentax never said that.
True, Pentax never says anything out straight. However, the 2012 Kitazawa interview hints towards it.
Please regard this question:
Why is the image circle of Sony's FF A-mount lenses larger then the FF image circle?
Answer:
To accomodate the sensor movement of the large FF sensor. That is exactly the same reason why DA lenses have an image circle larger then the required APS-C image circle.
Now, how big is the image circle of all current Pentax FF glass? Exactly: it's the FF image cirlce, without accomodating extra room for IBIS like Sony does. It's the old film format image circle and film didn't bounce around like a sensor on IBIS.
That means Pentax doesn't need to fill in a few gaps; they need to develop an ENTIRE new lens lineup if they want to go FF. Or, dump SR and introduce stabilisation in the lens.
I would do some looooonnnng deep thinking before making such a decision too, just like Pentax.
@Digitalis, I wasn't talking about flange distance, but diameter. But the image circle is what's the most relevant.