11-11-2012, 10:44 AM
[quote name='tomri' timestamp='1352552921' post='20915']
I tend to agree.
The corners on my lens show equal vignetting.
The blur shows only at 85mm and only in the leftmost 10%-15% of the frame.
On an interesting note, I found out this: When shooting upside down and also viewing the picture like that, the blur is still on the left hand side (instead of showing on the right). This is with IS on (I shot the test chart with IS off).
BTW the IS is really great. I got tack sharp images at 1/15s at 70mm hand-held :-)
But everything seems to have its price.
Maybe there is a reason the new 24-70L II still does not come with IS...
[/quote]
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...)
I tend to agree.
The corners on my lens show equal vignetting.
The blur shows only at 85mm and only in the leftmost 10%-15% of the frame.
On an interesting note, I found out this: When shooting upside down and also viewing the picture like that, the blur is still on the left hand side (instead of showing on the right). This is with IS on (I shot the test chart with IS off).
BTW the IS is really great. I got tack sharp images at 1/15s at 70mm hand-held :-)
But everything seems to have its price.
Maybe there is a reason the new 24-70L II still does not come with IS...
[/quote]
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...)