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Imatest Documentation Rope trick (for horizontal positioning) This trick uses rope and mirrors, as well as the red dots • tht mark the horizontal center of the target (or whatever marker you choose). This is as close to smoke and mirrors as Imatest gets. The cord should be about 1 meter long and have a weight on one end. A heavy nut— the type that mates with a bolt, not the type that grows on trees— serves well. Hold the cord in front of the camera (between the camera and mirror), and align your eye and the cord so the so the cord passes in front of the horizontal center markers (red dots • in the images), and so the reflection of the cord passes directly behind the cord. The camera is positioned properly if the center of the lens is aligned with the cord. If it isn't, shift the camera horizontally until it is. To complete the horizontal adjustment, rotate (pan) the tripod pan/tilt head so the chart is centered in the image frame. At this point you should be close enough to correct alignments so the final, fine adjustments should proceed quickly. Other targets The images below illustrate a problem that can arise using wide angle lenses. Glare appears in the outer patches, but it doesn't affect the critical outer edges. It's difficult to remove glare entirely: it can be impractical to place lights further from the target, and reducing the angle may make lighting too uneven. We have recently been dealing with glare by printing charts on high quality matte paper (Epson Ultra Premium Presentation - Matte), which resolves detail as fine as glossy and semigloss papers. Glare is rarely a problem with normal and telephoto lenses. Modified ISO 12233 (QA-77) and slanted-edge charts The QA-77 modified ISO chart, available from Applied Image, is printed on photographic media with higher resolution than is attainable with inkjet printers. It can be used with smaller image fields than inkjet-printed charts: valuable for close-up work and for analyzing telephoto lenses when space is limited. Note that the glare in the corner targets (no longer used) is doesn't affect the outer-most tangential edges. Careful positioning of lights is critical when working with wide-angle lenses. 76 of 451
Imatest Documentation Kodak Q-14 Step chart and GretagMacbeth ColorChecker ® These charts (normally framed much closer) are analyzed with Imatest Stepchart, Colorcheck, and Multicharts. They are mounted on neutral middle gray (~18% reflectance) mat board, which is mounted on foam board for rigidity. Shown in front of the wider slanted-edge target. The Q-13/Q-14 can be mounted vertically to reduce glare when used with wide angle lenses. OECF target, available from Applied Image The OECF target is valuable for measuring tonal response in cameras that have significant light falloff (vignetting)— especially for cameraphones, which are constrained to be extremely thin. 77 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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Imatest Documentation You can enter
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Imatest Documentation Instructions
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