Archived from groups: rec.photo.digital (More info?
"Celtic Boar" <email@example.com> wrote in message
>I have a new Canon 20D and took it out for a test run. I noticed a small
>dark smudge on each image in the same location.
> Here is a link for a sample image. Not a huge deal to clean up in an image
> editor but I would like to know what causes this. Is this typical of a
> sensor needing cleaning? Is it usual for a camera with no lense changes
> and less than 100 images to develop a spot like this? Or is it something
> else altogether?
Dust on the sensor. As Ed Ruf has pointed out, it could have been there
since you got the camera. Welcome to one of the down sides to DSLRs, dust
bunnies on the sensor. In my mind one of the FEW down sides, next to size
of the camera, and both are well worth it to me for the results they
For the record, I have bought 4 DSLRs new, 2 for work and 2 for home, 2
Nikons and 2 Canons. Exactly half of them have had a detectable amount of
dust on the sensor when I opened the new sealed box, the D100 (Nikon) and
the D60 (Canon). The D1x and the 20D were clean, and I did check all of
them as soon as I got them open.
Eventually you will have to clean any DSLR sensor, that is just a fact of
ownership. Unfortunately you are just being introduced to this joy earlier
than some are. On the other hand, you could send the camera in and have it
cleaned, I think Canon gives you one free cleaning the first year. But in
my opinion this is something everyone should learn to do.