Originally posted by Pål Jensen The viewfinder is actually the best rational argument for FF.
It's also the very essence of why Pentax has been losing its "enthusiast" customers to Nikon and Canon. As I mentioned elsewhere in this thread, the "glory days" of Pentax were in the
manual focus era. I know I found it impossible to focus manually with pitiful APS-C viewfinders, unless it was "infinity" (or close to it) type focusing in brightly lit conditions. Anything else, particularly with short focal lengths, was endless frustration. Cat's Eye screens didn't help either - I think they actually made it worse for me as opposed to better (I was never a fan of split-image focusing "aids," just give me a nice matte screen with at most a small microprism, ala the K1000, and I'm happy).
So, the choices become...
1. Endure the small keyhole in a thick door viewfinders - not even remotely acceptable IMO (I actually like to
enjoy photography, which is tough if your equipment annoys you!)
2. Replace all manual focus lenses with autofocus - in which case, why limit your choices by sticking with Pentax? If you have to buy everything "new," there's little reason not to switch to Nikon or Canon, and enjoy the benefits of "every lens made for dSLRs by every third party lens maker is made in your mount, PLUS what your camera maker has in its own line-up" that Pentax users
used to enjoy back in manual focus days.
3. Switch to Nikon or Canon, if (2) hadn't already taken you there.
This is exactly how Pentax has seen its user base shrivel, and is exactly why 3rd party lens support is drying up for the K-mount. No FF = continuation of decline, since the best selection of glass in K-mount is STILL manual focus glass, which isn't much fun to use on cameras with crappy viewfinders. Pentax has been "bottom feeding" in the camera market ever since then, and
that's why they have been losing market share, and why they are still losing it.
Repeating the same behavior and expecting the result to be different is one definition of insanity!