Originally posted by GoremanX Nope, they can't. You must've missed this part of my post :
Also the mirror box on the K-3 is too small for a FF mirror, this has already been explored in the past by many other members.
Everyone assume FF should be the easiest thing in the world for Pentax because of the existing back catalog of FF lens designs. But the fact is that many (most?) of those lenses have an image circle that just barely covers the frame. Any sensor shift would generate one or more soft corners and ugly vignetting. So to go full frame and retain compatibility with existing lenses, Pentax would have to either:
a) drop sensor shift or disable it on unsupported lenses (one of their defining features)
b) crop the image on unsupported lenses (to about APS-H size)
c) use an actual APS-H sensor
I far prefer the last option. It would give us a more agile camera with responsive sensor shift and retain SR on old lenses without IQ issues. The best of all worlds.
---------- Post added 09-07-14 at 09:42 AM ----------
..
"A rising tide raises all ships" Don't know who said that, but it seems to apply to sensors as well. For whatever reason, Sony has had the hot hand in designing sensors. And the biggest customers for the FF sensors is Nikon and Sony, probably in that order. For Pentax to order a custom FF sensor, such as the H size, would probably require Pentax to order such a large quantity of sensors from Sony that it would have no chance of selling in a reasonable amount of time. And Canon has been the only user of H size sensors and they don't sell to their competitors.
But i acknowledge upfront, my ignorance about economies of sensor ordering for cameras.
Perhaps GoremanX has touched on the real reason that Pentax has not built a FF DSLR to this point. Too many negative issues.
Originally posted by Fogel70 No, I have not missed it, it's just that the SR movement is not large enough to be an issues on most FF lenses. I don't think any Pentax K-mount FF lens will make the image totally useless when the FF sensor moves a few 1/10 of mm needed for 3-4 stops of SR. In worst case there will be small amount of extra vignetting in the images. But I don't see any reason for limiting all images to 1.3x crop because of this.
And as a 1.3x crop sensor will have to be custom made, it might make the sensor more expensive than a FF sensor. And to build the future development on a custom design sensor which might not get the best support from sensor manufacturers might end up a nightmare for Ricoh/Pentax.
New lenses also have to be designed for 1.3x crop which will make it difficult to move up to FF in the future, and we can all forget 3rd party support on lenses.
To only go half the way that the market want, is just not good enough.
Originally posted by Winder If they can make and sell DSLRs for a profit then they can do the same with a mirrorless. If they can't then Ricoh won't be able t save the brand and it doesn't matter.
Sony and Fuji have come into the APS sensor camera marketplace and to some degree taken away what used to be Pentax's main selling points, that is - small camera size, reasonable selling prices, and WR - namely Fuji Xti and Sony A7 series. One of the ingredients to this coup, has been new mounts designed to enable smaller size camera bodies and lenses, to some degree.
So i would suggest, that Pentax build a FF mirrorless camera, but with a modern smaller registration distance lens mount, that would allow Pentax to again compete in size against Sony and Fuji mirrorless camera designs. When a Pentaxian or anyone else buys this K-Short mount camera, I propose they be given an included electronic adapter that would allow all older and AF K-mount lenses to be used on the new mount - much in the same way as the FE and E mounts are now used with the older A-mount lenses.
And yes, i have a number of modern and older k-mount lenses that i use on K3 and K5 as well as on my Nex cameras. I have in fact used my DA-300 on the Nex 5n and 6. Works just fine, but of course one has to use the DA300 foot when using it on a tripod
My guess is that mirrorless cameras are the way forward and Pentax needs to have a bigger footprint in that marketplace.