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<blockquote data-quote="Eyelight" data-source="post: 337172" data-attributes="member: 24753">Been studying on this question and doing a little reading.&nbsp; 1st thought is, need to make sure the filter in use is a CP and not a linear polarizer.&nbsp; Linear will confuse the AF. If it is a linear filter, there is a note on <a href="http://http://en.wikipedia.org/wiki/Polarizing_filter_%28Photography%29" target="_blank">Wikipedia's</a> page that mentions a linear polarizer can defeat the action of the anti-aliasing filter.&nbsp; Never heard this before, but it kind of makes sense and it would mean some pics with the filter could be sharper.As fas as focusing, if the focal point is close to the camera (3 meters), a shift toward the camera of 1 meter has dramatic effect on DOF and 2 meters will wipe out most of the background focus.&nbsp; So, if the filter is confusing the AF, this could explain why nothing is in focus.A tripod set in sand is better than handheld, but not as steady as one set on solid earth.</blockquote>

[QUOTE="Eyelight, post: 337172, member: 24753"] Been studying on this question and doing a little reading. 1st thought is, need to make sure the filter in use is a CP and not a linear polarizer. Linear will confuse the AF. If it is a linear filter, there is a note on [URL="http://http://en.wikipedia.org/wiki/Polarizing_filter_%28Photography%29"]Wikipedia's[/URL] page that mentions a linear polarizer can defeat the action of the anti-aliasing filter. Never heard this before, but it kind of makes sense and it would mean some pics with the filter could be sharper. As fas as focusing, if the focal point is close to the camera (3 meters), a shift toward the camera of 1 meter has dramatic effect on DOF and 2 meters will wipe out most of the background focus. So, if the filter is confusing the AF, this could explain why nothing is in focus. A tripod set in sand is better than handheld, but not as steady as one set on solid earth. [/QUOTE]

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