Originally posted by Wired But I want more resolution, I want a bigger/faster buffer/processor. Thats all I want. Give me 24mp APSC and 9-12fps and a 30 frame buffer and I would be throwing my money at the cash register until they said stop.
You would only get more dots going to 24mp on apsc, not more resolution. The limiting point to a 24mp apsc is going to be the lenses. You can up res and get similar from a 16mp. Zeiss is working on lenses to match that level of resolution but they are going to big, expensive, manual focus, and probably only available in Canon and Nikon mounts. Leica also has a few lenses that could probably meet that; the Leica monochrome has established that several lenses keep going up in resolution as sensors allow it. The mp rush is a marketing thing from this point. To go up in resolution in reality you have to invest seriously in lens design or go to larger sensors utilizing larger image circles. For you this means staying with the D800 or moving to medium format.
Same goes for the D800 though, a next version with more pixels isn't going to gain resolution. Most lenses are already over stressed at the corners now. And on top of that diffraction becomes more apparent with a higher pixel density. Diffraction becomes very evident resolution loss stopping down and lenses already aren't sharp wide open very limiting DOF obtainable at a maximum resolution.
Of course the same goes for medium format as well which has narrower DOF as well for a given aperture. Increasing pixel density on the 645D will gain little resolution for a landscape photographer. Going FF645 would maybe improve things but I don't know how the corners of Pentax 645 lenses will perform at FF, would probably be stressed at much over 60mp, then you have to account for the reduced DOF and effects of diffraction stopping down. Main advantage of a FF 645 would be the angle of view achievable and possible increase in actual resolution.
It comes to a point when things all start to balance out without quadrupling your budget for lens design. Investments in sensor design are only going to gain lower noise and greater dynamic range. Increasing pixel count though has been proven to improve noise by down resing images. This is proven by the D800 compared to the D4...