RE: Imaging Sensor Problem

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Brian Gideon - 27 Feb 2007 19:43 GMT

Update...I justed figured out what's causing my problem. After
realizing that the over-exposed band was independent of all variables
except shutter speed I began suspecting the shutter instead of the
sensor. I found several posts on dpreview.com explaining exactly how
this band is produced. Apparently light is leaking through one of the
blades and so as the blade arcs across the sensor the leaky spot on
the blade causes more light to hit the sensor along it's path. The
effect is more noticeable on fast exposures because the amount of time
it takes the blade to cross the sensor is significant compared to the
exposure time. Eventually there will be complete shutter failure. I
only have 3,000 shutter actuations on my camera.

On Nov 16 2006, 3:29 pm, "Brian Gideon" <briangid...@yahoo.com> wrote:

> All,
>
> I have a Canon 300D which has worked quite well in the last 2 years.
> Recently though I began noticing a thick curved strip starting in the
> upper left corner of the image curving closer to the center as it works
> its way down to the bottom left corner of the image. The strip is
> between 100 and 200 pixels wide and appears in the exact same position
> in all images. The strip has a slight lightening or over-exposing
> effect. It is noticeable in some, but not all images. The aberration
> appears with different lenses so I can conclude it must be something
> with the camera and not the lens.
>
> Has anyone else seen this before?
>
> My best guess is a dirty or possibly defective sensor. Can someone
> comment?
>
> I have Adobe Photoshop Elements 4.0. Can I record a macro or something
> that corrects the problem and apply it to all images?
>
> Brian

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Charles Schuler - 27 Feb 2007 21:23 GMT

> Update...I justed figured out what's causing my problem. After
> realizing that the over-exposed band was independent of all variables
[quoted text clipped - 7 lines]
> exposure time. Eventually there will be complete shutter failure. I
> only have 3,000 shutter actuations on my camera.

Sorry to hear that ... perhaps Canon will help you out? Thanks for sharing.

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