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Lumix FZ20 corner blur samples

 
 
Alturas
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      10-05-2005, 08:29 PM
Below are two FZ20 examples of lower right corner blur with basic EXIF
info. These are crops of only the bottom 300 pixels due to space
limitations. The blur is not predictable but the lower right is
usually somewhat softer than the lower left in half my photos. In
these landscapes, the focal point is many yards away from the
foreground but depth of field keeps the foreground relatively sharp.
It almost looks like motion blur to me, which makes the OIS element a
suspect.

If anyone owning an FZ20 or other 12X Lumix reads this, can you tell
me if you get intermittent/variable blurring in one corner only? And
have you learned the cause of it? Zooming in and/or stopping down the
lens helps a lot in some cases, but why would only one corner be soft?

http://www.villagephotos.com/pubbrow...der_id=1475570

FZ20 crop 1 (meadow grass)
ExposureTime - 1/500 seconds
FNumber - 4.60
ISOSpeedRatings - 80
FocalLength - 15.60 mm
FocalLengthIn35mmFilm - 94 mm
Contrast - Normal
Saturation - Normal
Sharpness - Normal

FZ20 crop 2 (small pine trees)
ExposureTime - 1/400 seconds
FNumber - 4.00
ISOSpeedRatings - 80
FocalLength - 11.90 mm
FocalLengthIn35mmFilm - 71 mm
Contrast - Normal
Saturation - Normal
Sharpness - Normal


Alturas

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Robert Millard
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      10-05-2005, 09:18 PM
I've had a FZ20 for almost a year, and have never experienced corner
blurring.

What drives me nuts is a completely gray screen when I try to take photos
either in the fog, or under a dark overcast day. Is this the result of just
not enough light?

Bob


 
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Neil Ellwood
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      10-06-2005, 05:58 AM
On Wed, 05 Oct 2005 13:29:54 -0700, Alturas wrote:

>
> If anyone owning an FZ20 or other 12X Lumix reads this, can you tell
> me if you get intermittent/variable blurring in one corner only? And
> have you learned the cause of it? Zooming in and/or stopping down the
> lens helps a lot in some cases, but why would only one corner be soft?
>
> http://www.villagephotos.com/pubbrow...der_id=1475570

Could be lens misalignment
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Neil
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Alturas
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      10-06-2005, 06:27 PM
On Thu, 6 Oct 2005 05:58:19 +0000 (UTC), Neil Ellwood
<(E-Mail Removed)> wrote:

>On Wed, 05 Oct 2005 13:29:54 -0700, Alturas wrote:
>
>>
>> If anyone owning an FZ20 or other 12X Lumix reads this, can you tell
>> me if you get intermittent/variable blurring in one corner only? And
>> have you learned the cause of it? Zooming in and/or stopping down the
>> lens helps a lot in some cases, but why would only one corner be soft?
>>
>> http://www.villagephotos.com/pubbrow...der_id=1475570

>Could be lens misalignment


I just don''t know. It's not consistent. Sending the camera in for
repair would probably cause some other problem. Maybe I'll just do
some image sharpening in that one corner for keeper shots.

Alturas

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Ed Ruf
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      10-07-2005, 08:26 PM
On Fri, 07 Oct 2005 19:12:16 +0100, in rec.photo.digital Les
<(E-Mail Removed)> wrote:


>Could it be the image stabilization system*, I wonder. If you move or
>the vegetation moves, some lens components try to compensate. I guess
>that sometimes the compensation goes haywire and this could explain
>the inconsistency.
>
>* http://panasonic.co.jp/pavc/global/l...ois_leica.html


If you read the page you posted the link to you will see the correction is
gyro based so movement of the vegetation should have no effect on the
correction itself. Subject motion might be a cause of the blur, though for
a 1/500sec you might think it would be hard to notice. Now if the motion
was opposite the direction of the hand movement, then of course it would be
worsened.
----------
Ed Ruf Lifetime AMA# 344007 ((E-Mail Removed))
See images taken with my CP-990/5700 & D70 at
http://edwardgruf.com/Digital_Photog...ral/index.html
 
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Alturas
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      10-10-2005, 04:46 AM
On Fri, 07 Oct 2005 16:26:00 -0400, Ed Ruf <(E-Mail Removed)>
wrote:

>On Fri, 07 Oct 2005 19:12:16 +0100, in rec.photo.digital Les
><(E-Mail Removed)> wrote:
>
>
>>Could it be the image stabilization system*, I wonder. If you move or
>>the vegetation moves, some lens components try to compensate. I guess
>>that sometimes the compensation goes haywire and this could explain
>>the inconsistency.
>>
>>* http://panasonic.co.jp/pavc/global/l...ois_leica.html

>
>If you read the page you posted the link to you will see the correction is
>gyro based so movement of the vegetation should have no effect on the
>correction itself. Subject motion might be a cause of the blur, though for
>a 1/500sec you might think it would be hard to notice. Now if the motion
>was opposite the direction of the hand movement, then of course it would be
>worsened.


There was really no wind to speak of in my sample shots, and you'd
have seen blur elsewhere if it was just that. It's too consistent in
the lower right to have anything to do with the subject. Also, in most
of the shots the focal point was many yards in the distance. It
happens much less when the foreground is the focal plane.

I do suspect some interaction between the OIS element and other lens
elements. Maybe a combining of two flaws adds up to a larger one when
they line up just right. All speculation.

Alturas

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