English - Espaņol
Sharpness - Bokeh
with the One Dollar Resolution Chart (a7s vs 5N)
Foto tutorial (English)
Foto tutorial (Espaņol)
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
In this case I will compare my lens sharpness results with the a7s and the NEX-5N with Metabones SpeedBooster.
The SpeedBooster is a focal reducer: it multiplies the focal length and aperture of the lens by 0.71x. Since the 5N sensor is APS-C, you then have to multiply the result by 1.52x to get the FF-equivalent focal length and aperture (explanation here) (I know these terms are, strictly speaking, wrong; but they are useful, so, there). The 5N has more megapixels, but the a7s is full frame, and I have always defended that full frame is sharper (tests here). So, let's see how this goes...
The lenses I have tested are the following:
* Leitz Elmarit-R 24mm f/2.8 (1978) (Leica R)
* Leitz Elmarit-R 35mm f/2.8 (1978) (Leica R)
* Leitz Summilux-R 50mm f/1.4 (1976) (Leica R)
* Leitz Elmarit-R 90mm f/2.8 (1966) (Leica R)