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Sharpness - Bokeh
for 1080p video (with line-skipping)
Foto tutorial (English)
Foto tutorial (Español)
Equipment recommendations US-ES
Flaat for Canon
Flaat for Nikon
Flaat for the BMC
Flaat for NEX-5N
Old Picture Style Tests
550D video lineskip
APS-C vs Full Frame
Badly assembled lenses and image quality
Lens mount compatibility chart
ISO on different cameras
High ISO on the 5D3
DIY: DR test chart
RGBWK Bayer sensors
Notes on DoF-FoV
Notes on crop-DoF-FoV
Custom Cropmarks for Magic Lantern on the Canon 550D
How many megapixels do I want?
How many megapixels can I see?
Quick Monitor Calibration Chart
I cut a one dollar bill in two, taped it onto a piece of cardboard (one half around the center, the other half on the top right corner), and took lots of pictures of it, with several lenses and with several settings, with manual focusing, with a tripod, with mirror lock-up, etc.
Then I cropped a couple of interesting bits of those images, and pasted those 100% crops in the nice tables you can see below. These results neutralize field curvature: the result for "center" is taken from a picture in which I was focusing at the center; the result for "corner" is taken from a picture in which I was focusing at the corner.
The camera used was a Canon EOS 550D. I set the white balance the same for all shots, and set sharpness at the minimum.
These are the results with simulated line-skipping (downsampled using nearest neighbor). If you want to see results with bicubic downsampling head over here.
The lenses I have tested are the following: