Originally posted by normhead We tend to think of photographic things as doubling or halving being one stop. So when you think of going from A2 to A1 as being one paper stop, you realize 20% is a lot less than the 100% increase you'd need to maintain lw/ph ratios. But what lw/ph you need to make good prints has always been open to debate as well. These debates are endless circles.
Going from A2 to A1, there 100% increase in surface but only 41% increase in lw/hp ratio. (square root of 2) To continue on the analogy, from pixel count alone, 24vs16MP would be 0.5stop and 22% increase in lw/ph ratio (square root of 1.5).
But this is versus K5-IIs. Versus K5 or K5-II, you need to factor also the low pass filter removal. I don't remember where but on some tests charts you could get something arround 10% increase in practice. (while the 22% are purely theoretical).
We should be in the order of magniture of 30-35% lw/ph increase total from K5 to K3. That's 0.7-0.8 EV and so get you almost from A2 to A1. This also get you to D600 resolution levels.
I do not want to argue on the numbers infinitely, but I continously see the difference in resolution on K3 vs K5, it is there, really visible. As if it is usefull, it highly depend of what you do with your pictures.
Without cropping and for web usage one doesn't need 24MP for sure.
Last edited by Nicolas06; 10-06-2014 at 10:51 AM.