Originally posted by Rondec I think there is a deliberate mis-characterization of what was said in other threads. What was said was that in limited situations, APS-C cameras could match full frame color depth, dynamic range and resolution by using pixel shift. There is no doubt that this is true. However, (a) a full frame with pixel shift would out resolve an APS-C camera with pixel shift, (b) there are many situations where pixel shift is not usable due to artifacts and (c) full frame gives the benefit of offering faster lenses/shallower depth of field/better high iso -- things which APS-C does OK at, but not as good.
To give a serious answer to the question, there will be a replacement to the K3 II in the future and it will probably feature a second generation pixel shift, probably with some type of de-ghosting algorithim built in. This still won't replace full frame cameras, but it will make the feature more usable in a variety of situations.
I think that all biz-engineer wanted to ear: some pro FF argument so he could feel better with everybody saying no the FF is great bla bla bla
While I agree that in general this is true, the other thread shown that it is a bit more complex than that. Sure the best FF with best lenses are going to do better than the best APSC with best lenses but this doesn't apply in every situation.
- If you care about sharpness, you need an FF body that has more MP to begin with otherwise there will be no significant difference. You cannot get a basic low MP FF and claim it will print A0 at 300dpi (last time I checked it still required more than 100MP...) it will actually print the same size with the same dpi as any camera with same MP.
- if you care about ultimate razor thin deph of field, you'll need fast lenses, so that's f/2.8 zooms and better f/1.4 primes. If you get a slower lens on you wider sensor or just get a zoom while another shooter will use a prime, then the advantage is lost.
- if you care about low light performance, the compromize is the same as on APSC: you'll get less deph of field, less dof by using wider appertures. You can stretch it 1EV more with FF, counting you can find a fast enough and affordable enough lens. That's best exercized with a 85mm f/1.4, there no 50mm f/1 lens on APSC to match or with an 70-200 f/2.8 zoom there no 50-135 f/2 lens to match. But say you are interrested in FF equivalent 100-300 or a 400mm prime and you'll spend many thousand dollar to keep this adventage again quite affordable 70-200 f/2.8 and 300mm f/4 lenses available on APSC.
Sure lenses tend to perform better stopped down and that FA50 f/1.4 isn't going to be that sharp and contrasty at f/1.4 or even f/2... That's maybe one of the most significant adventage, but again you don't need your lens to be perfect, just good enough. the FA50 isn't maybe good enough at f/1.4 but the 50-135 at f/2.8 might very well be. The real issue is this one has slow AF, not that is not sharp enough.
The advantages are there, sure. On reviews and charts they are obvious. By the numbers you really get an edge with an FF body. But if you ask people if a given picture was taken with an FF or an APSC or even an m4/3, they have some difficulties to guess.
If you make a living out of photography, or if you are the type that need the best, then, go on. If you have other activities in life and maybe not enough money to buy always the best, all the time, really you will not loose that much with a more basic APSC camera. People will argue but most often will fail to guess the camera or the lens that was used for the shot. Cheat and say it was taken with an FF, nobody will ever catch you if you deleted the exifs.