Why does the technique of the previous post work? I think it may be a combination of the following:
- I didn’t use liveview to focus the D3s reference image, so it could be slightly less well focused than the Sony images. I will use liveview in future testing, although it increases noise by heating the sensor. Should I make the reference images by focusing with liveview, then turning it off, letting the sensor cool down, then making the exposure? Or is that tilting the playing field too much? [Addendum: I made some test images, and that’s not it; the autofocus pictures are as sharp as ones focused manually with the aid of liveview.]
- The antialiasing filter in the D3s blurs more (measured in microns, not pixels) than the AA filter in the Sony’s, because the pixel pitch is larger.
- The processing done by Perfect Resize artificially sharpens the image. If that’s the case, does that processing adversely affect some subject matter? It’s not just the usual sharpening, because I can’t duplicate it with the Nikon images. It will take some testing to find out.
I wonder how far I can push the ISO and still get high-quality 5 megapixel images? I wonder what would happen if I resized the NEX-7 images to 12 megapixels and compared them with full frame D3s images? More to come.