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<blockquote data-quote="aroy" data-source="post: 524539" data-attributes="member: 16090"><p>I would suggest that you take the following steps to home in to the problem area</p><p></p><p><strong>LENS AF</strong></p><p>1. Set up the camera on a tripod</p><p>2. Use the following settings - Fixed ISO 100, Aperture priority - F2.8, AF-S, Single focus point, RAW, select centre focus point</p><p>3. Focus on an object about 20 feet away, using the centre focus point only</p><p>4. Take a shot</p><p>5 Repeat the shot with aperture at F4, F5.6, F6.3 and F8</p><p></p><p>Check the results on the computer. If the images at all the F stops are still fuzzy, then there is an AF problem. If the sharpness increases with F stop, the AF fine tune is indicated. To check for AF accuracy</p><p></p><p>1. Put a graduated scale (1 foot/30cm will do), on a table set against the wall. The scale top should rest against the wall and the bottom away so that it is inclined at approximately 45 degrees.</p><p>2. Set up the camera on tripod, level the camera so that it is horizontal. Raise/lower the tripod so that the centre of the scale is at the centre of the focus grid</p><p>3. Take a shop wide open - F2.8 in your case</p><p></p><p>Now check the sharpness of the scale on the computer. If the AF is spot on the centre graduation (where you focused) will be sharpest. If there is front/back focus then the sharpest graduation will below/above the centre. Use the camera AF fine tune to get the AF spot on. A few trial and error will be enough.</p><p></p><p>In case that does not help, then either the lens or the body is malfunctioning. If you have another AF lens use it and see if the problem persists. If not, then your the problem is with your lens. Otherwise it is <strong>CAMERA AF</strong>.</p></blockquote><p></p>
[QUOTE="aroy, post: 524539, member: 16090"] I would suggest that you take the following steps to home in to the problem area [B]LENS AF[/B] 1. Set up the camera on a tripod 2. Use the following settings - Fixed ISO 100, Aperture priority - F2.8, AF-S, Single focus point, RAW, select centre focus point 3. Focus on an object about 20 feet away, using the centre focus point only 4. Take a shot 5 Repeat the shot with aperture at F4, F5.6, F6.3 and F8 Check the results on the computer. If the images at all the F stops are still fuzzy, then there is an AF problem. If the sharpness increases with F stop, the AF fine tune is indicated. To check for AF accuracy 1. Put a graduated scale (1 foot/30cm will do), on a table set against the wall. The scale top should rest against the wall and the bottom away so that it is inclined at approximately 45 degrees. 2. Set up the camera on tripod, level the camera so that it is horizontal. Raise/lower the tripod so that the centre of the scale is at the centre of the focus grid 3. Take a shop wide open - F2.8 in your case Now check the sharpness of the scale on the computer. If the AF is spot on the centre graduation (where you focused) will be sharpest. If there is front/back focus then the sharpest graduation will below/above the centre. Use the camera AF fine tune to get the AF spot on. A few trial and error will be enough. In case that does not help, then either the lens or the body is malfunctioning. If you have another AF lens use it and see if the problem persists. If not, then your the problem is with your lens. Otherwise it is [B]CAMERA AF[/B]. [/QUOTE]
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