MTF
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MTF Modulation transfer function.
A measure of resolution for lenses and/or film.
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MTF = (max intensity - min intensity)/(max intensity + min intensity)
The important point to note here is that the blurring of the image isn't necessarily due to any defect in the lens. Even a perfect lens does this because of diffraction.
How to interpret MTF-data:
Contrast/Brilliance: Readings at 5 (and maybe 10) lp/mm represent the contrast-behaviour of a lens. Even small differences (2.5% !!!) can be identified on the picture! ...
MTF Modulation transfer function.
Techniques Glossary MTF Modulation transfer function.
A measure of resolution for lenses and/or film.
MTF
acroynm for modulated transfer function.
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a kiln or lehr constructed so that the ware is not subjected to direct radiant heat from the elements (electric) or to direct flame from burners (oil, gas).
MTF ( modulated transfer function )
The frequency response of an optical system. Also a test that measures the optical frequency response of a scanner or other optical system. See also transfer function. Modulation Transfer Function.
Show MTF-50 & CA graphs - hiding the graphs allows you to see checkerboard patterns across all four diagonals. On the right of the screen, a 'belt buckle' display illustrates the range of sharpness across the frame:
Next - Distortion Display ...
MTF
Modulation Transfer Function. The way people (who else, the magazines!) uses to measure a lens's ability to hold diminishing details of a subject. Why MTF ?
MTF (Modulation transfer function) A comparison of contrast between a test chart and the reproduced image. One of the measurements of lens performance used in the manufacturing process.
Now we get to MTF (Modulation Transfer Function). This is a measure of lens performance and shows how well a lens reproduces object detail in the image it produces.
One of the cool things about the Pentax K10D is an MTF-biased program mode. Although the f/8 and f/11 mentioned are good guesses, they're not necessarily the best for every lens.
Read more:
Superresolution FAQ
Superresolution testing by MTF measurement
Still image superresolution examples
Superresolution video example
Comparison of various superresolution methods with examples ...
Unfortunately, like grain, there is no easy way to measure how sharp a lens is. (Well, there IS a way, the MTF, or Modulation Transfer Function, but this is a bit beyond the scope of this guide, and is seldom used to evaluate non-SLR lenses).
You can look up the MTF scores on sites such as Photodo, which is a useful guideline, but the only way to compare lenses properly is to test them yourself to see if they meet your needs. Asking, "Is the Tokina XYZ 2.
 See also: Image, Lens, Aperture, Camera, Film
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