Same old suspects, same old conclusions...
So far a 24 MP FF increases MTF 13 % for a 50% increase in file size. Over a 24 MP APS-c camera, and that only in lab tests. IN tests in the field it's almost certain to be closer, although, no one is testing. There exists a serious case of the law of diminishing returns. People always say there is no wide angle 1.4 lens for APS-c. People never say there is no 1.4 135 for FF, but there is an 85 1.4 for APS-c that has the same FoV? When something is true at one end of the spectrum, it's also true at the other. People ignore the back end of trade offs. Or even more likely, they post theory to prove that it is in some way not true.
But the killer is, that people who say they can't live without a WA 1.4 lens, never seem to know what percentage of their WA images were best taken at 1.4. Someone should post a break down so we know what we're missing. Not how many were taken, I've taken a huge number of images @ 2.8 up until F16. F 16 it turns out is a lot more useful than F-2.8. I'm guessing 1.4 would be even less useful than 2.8.
There I've said my same old thing, issued a challenge that will be ignored. Now I expect a line by line breakdown of my post with at least one poster will post that he's not telling because i wouldn't listen anyway.
What's funny...
people who mix the FF argument with the image size argument. If you're talking FF vs APS-C , keep the discussion to the discussion of sensor size. Pixels is another issue. We can argue that quite conclusively that a D800 out resolves all other APS-c and FF cameras. It's just not an issue related just to sensor size.
The biggest reason, for not wanting a Pentax FF? I'd have to buy a 31 ltd to make it worth my while. I find the distortion, whether aspherical or not can be disturbing in APS-c WAs. That's the only lens I can think of I'd rather use on an FF system than APS-c. But, my 21 ltd really isn't that bad for the same FoV. I use WA for landscapes. F 1.4 in landscapes is probably about as useless as...._________ (insert your favorite useless thing)
You definitely have more lens choices with APS-c. With APS-c you can use FF lenses, like my A-400 FF lens to great advantage. You can use APS-c lenses, only as APS-c lenses. Even the D800 only gives you 15 MP in crop mode. People seem to forget you have an MTF advantage using a K-5 over a D800 used in crop mode, using the same lens. The D800 is less, all other FFs are way less.
FF isn't the holy grail. But there are a lot of folks who are completely fixated on it, and possibly not in a good way... and that's the truth.
Last edited by normhead; 05-26-2013 at 01:59 PM.