11-11-2012, 02:26 PM
[quote name='photonius' timestamp='1352630696' post='20917']
If shooting upside down does not flip the softness, then the error could lie outside the lens. Did you check if this softness is due to slight difference in focal plane, i.e. can you focus left and right separately for optimal focus. Perhaps the lens focal plane is not completely parallel to the sensor plane, possibly the lens axis is not completely perpendicular to the sensor due to the tolerances in the the camera body (lens mount, sensor...)
[/quote]
Well, I did that upside down test quickly and hand-held based on things I read on the net.
Maybe the result should not be counted as reliable/accurate.
There are just too many things that could go wrong that way.
If shooting upside down does not flip the softness, then the error could lie outside the lens. Did you check if this softness is due to slight difference in focal plane, i.e. can you focus left and right separately for optimal focus. Perhaps the lens focal plane is not completely parallel to the sensor plane, possibly the lens axis is not completely perpendicular to the sensor due to the tolerances in the the camera body (lens mount, sensor...)
[/quote]
Well, I did that upside down test quickly and hand-held based on things I read on the net.
Maybe the result should not be counted as reliable/accurate.
There are just too many things that could go wrong that way.