Originally posted by ElJamoquio Anything is debatable. If someone feels like APS-C can be printed as large as FF I won't 'debate', I'll tell them they're wrong and move on.
The question of 'how big' APS-C can be printed while still looking good is debatable of course and is completely subjective. I have people telling me that every 24MP image can be printed to the same time, too, though, so there's plenty of misinformation out there.
Someone might feel that both APS-c and FF can be printed larger than they'd ever print and that the whole point is meaningless. On comparisons of prints up to 24 x 36 there has never been an un-biased consensus on whether a D800 was visually superior to a K-01 image. Technically superior isn't an argument, but visually superior is. I keep saying it, you keep not getting it.
Photography is a visual art, what is important is the visual impact of the image, the technical aspects of the photo are secondary. You keep assuming that a D800 image viewed at 96 inches wide ( or som either arbitrary point) would be better than a K-3 image, but no one has actually done a side by side comparison to prove that. No one has ever been able to precisely determine the point at which the D800 image becomes better. Sure you can see a difference in detail, but does that improve the image? And that critical question seems to be 6 of one half dozen of the other situation. This has been the flaw in your argument since the beginning. You equate visual impact with technical superiority, without ever proving the point.
One of the other teachers on the forum tested his students to see if they could tell the difference between prints made at different resolutions, some twice as high as the others, and 90% of his students couldn't tell the difference between one printed at less than 90 DPI, and one's printed over 150 DPI. Everything I've seen in this regard would suggest that the human end of the equation has not been adequately explored or is even understood. Every expert I've read admits to having to deal with confusing results right up front. And not one has been able to, after careful research, to suggest that they have any understanding of what their results mean. Only the ignorant can profess to be knowledgeable on this topic, and they do so by making assumptions unsupported by research of any kind.
The experts throw out a few numbers and admit they need to do a lot more research.