I've recently started having a problem with my Canon 1Dm3 + 70-200 2.8 (non-IS), where a small part of my photo is blurry, it always seems to be the same area of the photo, and it doesn't happen all the time. Since everyone here shoots airplanes with similar techniques, I'm hoping someone might be able to help. I'll copy the details that I posted on a photography forum:
I've started getting blur (looks like motion blur) on only a small area of some of my photos (in what seems to be the same area each time). Left and right of the blurred area, the subject is sharp, so it's not a DOF issue. I'm also not changing the focal length (it was fixed at 80mm for 3 side shots, and all were blurred). Here's a sample of a 100% crop of the affected area, along with a thumbnail of the entire uncropped photo so you can see the area relative to it. You can see the blur most noticeably on the "UNITED ST" and #2-3 engines.
1/1000, f 9.0
http://i164.photobucket.com/albums/u...k2179/crop.jpg (since large images are resized here)
I'm panning right to left with the plane, but it's a smooth and slow pan, and this is the non-IS version of the lens. The strange thing is that some of my other pics from the same day don't exhibit the blurring - the only difference being they were taken at 150-200mm. Could this be a case of lens decentering, or something else? Thanks.
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One person said decentering would be soft/blurred only on one side, and not between two sharp areas. Other than that, I think I can rule out:
-Motion blur (shooting at 1/1000, and only one area is blurred)
-Zoom blur (I shot 3 photos in a row, all at 80mm - all have the same problem)
-DOF (f 9.0, plus other areas in the same plane are sharp)
-FOD (I checked the front/rear lens surfaces, along with the 1Dm3's sensor for smudges or other debris)
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