ISO 12233 PDF
ISO Test Chart. In Standards Organization adopted ISO Standard Photography Click here for a printable PDF version. ISO specifies methods for measuring the resolution and the SFR of electronic still-picture cameras. It is applicable to the measurement of both. View Account▹ · Home; BS ISO Secure PDF. ℹ Printed Edition + PDF; Immediate download; $; Add to Cart.
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Résolution et réponses en fréquence spatiale. STANDARD. ISO. Third edition. Reference number. ISO (E). This document is a. ISO INTERNATIONAL. STANDARD. ISO. First edition Details of the software products used to create this PDF file can be found. The ISO chart contains a lot of areas suitable for testing purposes. ISO Test Chart - contains a printable PDF version and several links for buying .
Even a badly decentered lens may look reasonably good when stopped down. If you have a question if this is happening, just walk around to the front of your setup and look into the lens barrel.
The star chart in the center of the test target makes it very easy to focus in live view, but first examine the pattern of the chart just out of focus at maximum magnification. On a well aligned lens the star should blur into a fuzzy oval like three of the images below do. A badly decentered lens will blur with a flare going in one direction or another, like the image on the lower left below.
This amount of flare can occur on some normal lenses, but the amount on the lower left is never normal. When you get the star sharply focused, the pattern should be circular, like the image below. In some decentered lenses the gray circle, where the individual star lines blur together will be oval. In other types of decentering, you may notice the more vertical stars are much sharper than the horizontal stars, or vice-versa. I suggest taking a photograph with the center both in and slightly out of focus.
The idea is NOT trying to measure how well the lines resolve, especially in live view.
Photography -- Electronic still picture imaging -- Resolution and spatial frequency responses
No further testing is needed, go take pictures. When you examine them, the corners all look a bit soft, but equally so. The second step is to zoom in on one corner and manually focus the lens to bring the corner into best focus.
And by how much? Once any corner is in sharpest focus, move the cursor around to check the other three corners and see if they are all equally sharp again.
Field curvature, which is a normal part of lens design, means the corners will have a different focus point than the center.
But since our alignment is square and centered to the chart, the 4 corners should all focus at the same point. As long as they do, this part of the test is normal.
In reality, there are three types of misalignment: A badly aligned lens often has more than one problem and the symptoms overlap somewhat, but we can make some generalizations.
A mildly tilted element often causes two corners to be different than the other two corners. It can be side-to-side, top-to-bottom, or opposite corners. How do we tell this is simply tilt, rather than another form of decentering? With tilt, changing focus often makes the top two corners sharp, but the bottom corners will get fuzzy or left and right, etc.
With other problems, the top two corners usually never get sharp, they always remain softer than the bottom corners. A mildly decentered lens may only have one bad corner rather than two like the example above.
In that case center resolution is always still excellent, although on an optical bench or in an Imatest lab you might notice the sharpest point of the lens has moved slightly off center, away from the bad corner. In other cases the problem affects only the horizontal or vertical line pairs, like the image below. One other interesting finding that we sometimes see in this situation: There are some lenses that will show this astigmatism-like behavior in all 4 corners.
But if only 1 or 2 corners show it, the lens has issues. A badly tilted element, especially if near the rear of the lens, can make the entire image soft, even in the center. Spacing errors, and significant decentering of an element can have the same effect. Sometimes a decentered element leaves the center of the lens quite sharp, but all 4 corners very soft. A little common sense helps in this situation. You should expect 10X consumer grade zoom to be rather soft at the long end.
Even good telephoto zooms often have soft corners at the extreme telephoto end. First and foremost is the center star target. A lens decentered this badly will almost always have a significant flare, like we demonstrated above, when just slightly off focus. Some will even show flare at their best focus. If you examine the corners carefully they may all be soft, but one is usually quite a bit better than the others, and one quite a bit worse.
ISO 12233: Ver. QA-76 Digital Cine resolution chart
Examining the thick black boxes will often show chromatic aberration at the edges and it will be of odd pattern: It might be away from center on one side and toward center at the other, etc. Obviously all lenses will be a bit sharper stopped down.
Zoom lenses have to be checked at 2 or 3 spots. Most optically challenged zooms are bad throughout the range, but there are definitely some that only have a problem at the long or short end. Because of the limitations of chart size, testing at a given focal length is only done at one focusing distance.
There are lenses, although they are rare, that have problems at certain focusing distances but not others and this test might miss that problem. But optical benches and Imatest have the same limitation; they only test at certain distances. One thing I should note: Watch the top-most crop as you switch the displayed results using a button click or mouseover between the compared lenses. If the reviewed lens shows larger details than the distortion-free comparable lens, it has barrel distortion.
If the reviewed lens shows smaller details than the distortion-free comparable lens, it has pincushion distortion. The difference is the size of the details indicates the amount of distortion present.
This chart is black and white only. If you see other colors — most often in the corners bottom two crops , the lens exhibits CA. Variances of brightness in the bottom crop sample can be attributed to two things. This difference is very helpful to see and compare. At narrow apertures, where light fall-off is no longer an issue, the power of the flashes must be turned up dramatically. It is very hard to illuminate the chart perfectly evenly at this flash power level and the corners may be slightly brighter due to light fall-off across the chart from the flashes.
Also, even though the lights are close to the test target plane, reflections are still a problem when testing super-wide angle lenses. I've implemented a newly-available larger test chart in to help with this issue. For the most part, I find the results to be very indicative of the image quality of the lens being tested and the comparisons work very well — the results are even better than I had hoped for.
Select the first test on the left and the comparison test on the right. You will see the test results selected on the left until you hover your mouse over the result images or the arrow — then the compare-to test results appear.
Moving the mouse back and forth toggles the results — my favorite way to visually compare lens and camera test results. You can even compare a lens to itself. Additionally, the arrow buttons between the lens models can be clicked to lock the displayed results ideal for mobile device users.
Buying a real ISO 12233 chart
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Port and Environs Strategy Esperance clean-up and recovery.There are some lenses that will show this astigmatism-like behavior in all 4 corners. Please keep in mind that the results must not depend on the precision of autofocus of the device being tested.
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ISO 12233: Ver. QA-72 Digital still-camera resolution chart
Moving the mouse back and forth toggles the results — my favorite way to visually compare lens and camera test results. You will see the test results selected on the left until you hover your mouse over the result images or the arrow — then the compare-to test results appear.
There are lenses, although they are rare, that have problems at certain focusing distances but not others and this test might miss that problem. Click here for a printable PDF version.