Some people, for example, have an unconscious habit to move forward a half an inch in the process of taking the shot, and such movement would absolutely destroy any meaning to this test.
If you are getting really slow shutter speeds like 1/10, then it means that you do not have sufficient ambient light.
Insist on making them pay for shipping and insurance if the product is under warranty.Here is my recommended approach to handle this particular issue: Retain all sample images you have taken with the camera.Please let me know if you have any questions!The basic premise of a chart like this is that when photographed at an angle, the paper slices through the plane of focus.This way, I feel sure that the autofocus is starting from scratch each time.Clearly these will never be as good as, or as accurate as properly produced charts.It makes sense to select the center image on page option, if your print dialog offers.Provide the image samples to the support personnel and if they question your testing methodology, provide the URL to this article.Deciding how far away you should be from the chart is influenced by what kind of test you want (some lenses display autofocus accuracy that varies with subject distance the focal length of the lens, and the nature of your autofocus sensors.Make sure that the camera is not tilted left/right/up/down it must be parallel to the wall.It certainly also creates a lot of frustration for the seller to deal with these issues and they are obviously not to blame for manufacturers defects or QA issues.Square to the Chart it makes interpretation easier if you're exactly square to the bottom of the chart (that is, you're aiming straight to the chart on the horizontal plane, without any side-to-side angle).With my printer on my paper in the light I use for tests with my camera, 25 gray seems to be the sweet spot.On the Nikon D800, for example, you go to Setup Menu- AF fine tune- AF fine tune (On/Off)- OFF.
Go ahead and press the shutter button now and capture the image.
Besides giving a crisper print, the paper is more sturdy, which makes it resistant to curling and warping (both of which are detrimental to its successful use in testing focus).What You See What the Autofocus Sees mouseover a button to see that image.Without the first, the test has absolutely no meaning, and without the second, you can't grasp the meaning it holds.The other patterns are mostly for computer measurement analysis.Consider this example: Nikon D200 Nikkor 17-55 f/2.8 @ 55mm 1/3000 sec, f/2.8, ISO 100 full exif The Clear Area is Clearly Clear The depth of field here is only about 8 millimeters (a third of an inch so it's fairly easy to see the.If you suspect you have equipment with autofocus problems and mention it on a photography forum, such as those at Phil Askey's most excellent.If you only have one camera and one lens then send both.Had it been taken with a short focal length at a close distance, it's possible that the depth of field would start to skew more toward the rear, and as such, a result like this might be expected.