« on: February 22, 2015, 10:58:22 PM »
I guess it depends on how you're looking at the images. I found moving to a retina iMac+SSD both terrific (because it's pretty quick, and I don't have to wait long for Photoshop) and hard on the photos I take. I don't have to crop the 7dii images much before the loss of quality is obvious. I still need to able to crop, to fix composition when a bird is flying past at speed, etc, and over the last few months having a 5k screen is really making me work harder in the field to get the composition exactly right, because there isn't much room to move in post. But then I'm looking at the images on screen, not printed etc...
But if you only have 18MP to start with, you can't afford to crop your image because you have so few pixels to work with. Lets say you want to crop to 1.6x, that leaves you with a 7MP image... that isn't even enough to display on a 4k monitor, let alone print in large sizes... So it seems you would be better off with more MP and slightly higher per pixel noise, since you would still have a useable image when you were done.
I think 30-50 MP is the sweet spot for current sensor tech. It lets you get great high ISO noise and still have plenty of room to crop your pictures. The A7r and the D810, both have great high iso performance and both have >30MP's. I would rather they keep the pixels from 30-50 and just keep improving the ISO performance and FPS and AF.
Is funny seeing text that suggests 18 million pixels is not very many. Another advantage is the effects it has on computer processing. The 50MP files in Tif format will be quite large and doing manipulations in Photoshop etc will be affected.