Resolution Charts for use in the film industry. Test kit based on a modified USAF 1951 test chart.Ĭinematographer, has developed a set of Target Nature photography pages, had a page on Technical His Mediumįormat Articles Page is also a great resource. Lens Resolution Testing page contains links to test targets andĭiscussions about image sharpness. The Imatest slanted-edge SFR method produces even more accurate and repeatable results. Images the test chart sine pattern can produce MTF plots using either the free software described below or Imatest Log frequency (more convenient and accurate). (Distortion, light falloff, and lateral chromatic aberrationīe corrected in software.) For film, these tests provide an approximateĮstimate of the 50% and 10% MTF frequencies- far from precise, but Uniformity of illumination, color rendition, "bokeh" (out of focusĮtc., many of which are tested by Imatest, but sharpness is arguably the most important contributor to image Other attributes that affect image quality: distortion, contrast, The lens tests presented here deal primarily with sharpness. Tripods, filters, film, mirror lock, etc.- affect image sharpness. You can learn how other aspects of your technique and imaging.Image center, or with distance from the subject?
You may want to learn more about the fine details of itsĮxample, how does sharpness vary with aperture, with distance from the.You may not be able to find test results for your particular lens.You may have a limited periodĪ newly purchased lens, and you need to evaluate it quickly. Some excellent lens test results are available on the Internet. If you're normal or mathematically challenged, you Of a maligned and misunderstood but highly elite fellowship. Do you get excited by a good equation? Were youĪbout your college math classes? Then you're probably a math geek- a This approach is primarily intended for film images, but Imatest Log frequency analyzes digitized images of the chart described below.Ĭameras or digitized film images, the approach used by Imatest is far You can download,Īnd assemble it yourself. Which has continuously varying spatial frequency. In this page we discuss lens testing (actually,Ĭomplete photographic systems) using the Koren 2003 lens test
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