3 hours ago
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Re: UPDATE
In reply to quota,
7 months ago
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quota wrote:
could iit be your lens is suffering from (severe) field curvature?
If you think about it, a wide lens focused correctly on the center point would show a bit of back focus when using the exterior points because assuming a perpendicular target, the center point of focus is actually closer than points further from the center. Greater the field of view, greater the back focus.
Ben
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