Test results: MTF (Sharpness)
Our MTF tests are conducted using Applied Imaging charts and software. We’ve tested the Sony Zeiss Distagon T* 35mm f/1.4 ZA on the Sony Alpha 7R, which has a 36MP full frame sensor and no optical low-pass filter.
Our tests reveal a lens that is impressively sharp in the centre wide open, however the corners are somewhat soft. Stop down to f/2.8 and the centre sharpness up a little, but the edges stay much the same. Much bigger improvements follow, though, with the very best results from f/5.6 to f/11. At the minimum aperture of f/16, diffraction slightly softens the image.
