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Imatest Documentation 3x enlarged image of the center of a star pattern acquired on the Canon EOS-40D, 24-70mm f/2.8 lens set to 50mm, f/8 (a sharp setting) Normalization: MTF is normalized using (1) MTF at the outer radius of each segment, (2) the maximum value of MTF at the outer radii of all segments, or (3) the difference between the lightest and darkest square near the pattern edge. Neither case (1) nor (2) is ideal because the minimum spatial frequency is not as low as it should be for correct normalization. (The high to low spatial frequency ratio is only 10 or 20 for the star charts — much lower than for the Log Frequency or Log F-Contrast charts.) In general, normalizing MTF to the outer radius of the star increases MTF above its true value. MTF should ideally be normalized to a lower spatial frequency, as with case (3), which should only be used with maximum contrast charts. 218 of 451
Imatest Documentation MTF Compare Compare MTFs of different cameras and lenses Introduction to MTF Compare MTF Compare, a module of Imatest Master, is a post-processor for comparing the MTFs of different cameras, lenses, and imaging systems after they have been analyzed by SFR or Rescharts Slanted-edge SFR and had results saved in CSV files. Comparisons are displayed as quotients of MTFs, i.e., transfer functions. For two imaging systems A and B, MTF Compare plots MTF(A)/MTF(B) or MTF(B)/MTF(A) along with MTF(A) and MTB(B) (shown as faint lines below). Details depend on the Display setting. Displays ratios or values of MTFnn (spatial frequencies where MTF is nn% of the low frequency value) and MTFnnP (spatial frequencies where MTF is nn% of the peak value) for nn = 70, 50, 30, 20, and 10. These comparisons contain more detail than simple comparisons of MTF50 or other summary results (MTF20, etc.). As with all Imatest modules, a great many display options are available. MTF comparison of Canon 24-70mm f/2.8L, 70mm, high contrast edge near center A. f/2.8 (pale brown), B. f/8 (pale blue) MTF Compare opens some intriguing new possibilities for Imatest. By using an autocollimator to project a slanted-edge pattern on a sensor, sensor MTF can be measured in isolation— without the effects of a lens. If the same sensor is then measured with a lens, MTF Compare can be used to factor out the sensor MTF (as well as that of the signal processing) so the MTF of the lens itself can be measured. This is done by dividing the system MTF by the sensor-only MTF. We are working with well-known autocollimator manufacturer to create an integrated turnkey solution. Stay tuned... 219 of 451
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