A few posts ago, I showed you the results of running slanted-edge modulation transfer function tests on the Sony a7 and a7R, both handheld. Since the cameras have different resolution, and the test results for MTF50 were in terms of cycles/pixel, I multiplied the a7R values by 1.22 so that the MTF50 results were in… [Read More]
Archives for March 12, 2014
The intellectual underpinnings of MTF analysis for handheld images, part 2
Actually, this post applies to MTF analysis in general, whether the camera is on a tripod or not. In the previous post, I said: to get the system’s modulation transfer function (MTF), we perform a Fourier transform on the system’s impulse response, or point-spread function (PSF), and throw away the imaginary part. What do we… [Read More]
The intellectual underpinnings of MTF analysis of handheld images
A few days ago, I made a post with a handwaving defense of the use of slanted edge MTF metrics for analyzing handheld image sharpness. Today, I’d like to take another crack at it, this time with more rigor. The upside? A clearer basis for the capabilities and the limitations of the technique. The downside?… [Read More]