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Spot on 20D Image

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Anonymous
February 6, 2005 2:45:51 PM

Archived from groups: rec.photo.digital (More info?)

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.

http://webpages.charter.net/rflohr/034.jpg

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?

Thanks for the help.

--
Rikk Flohr

website: www.fleetingglimpse.com
blog: http://spaces.msn.com/members/fleetingglmpse/

More about : spot 20d image

Anonymous
February 6, 2005 3:59:07 PM

Archived from groups: rec.photo.digital (More info?)

On Sun, 6 Feb 2005 11:45:51 -0600, in rec.photo.digital "Celtic Boar"
<extraneous@charter.net> wrote:

>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.
>
>http://webpages.charter.net/rflohr/034.jpg
>
>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?

Yes. Notice this shot was taken at f/14. Dust on the sensor/filter will
show up more as the lens is stopped down,

> 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?

Did you take a sky shot stopped down right away. It could have been there
from the beginning.

----------
Ed Ruf Lifetime AMA# 344007 (Usenet@EdwardG.Ruf.com)
See images taken with my CP-990/5700 & D70 at
http://edwardgruf.com/Digital_Photography/General/index...
Anonymous
February 6, 2005 3:59:08 PM

Archived from groups: rec.photo.digital (More info?)

No, most of the earlier shots were taken indoors. Lense wide open so I
probably didn't notice. Good point.

Rikk.
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Anonymous
February 6, 2005 8:42:52 PM

Archived from groups: rec.photo.digital (More info?)

Not a big deal. It is very likely (most probably) dust on the sensor. Get
yourself a hand squeeze "Rocket Blower," they cost about $8 or $10. Attach
your camera to a sturdy tipod and face it down and then very carefully
follow the directions in your Canon manual to blow out the dust. You will
probably be surprised how easy it is.

I noticed my first dust bunny group while photographing a jet passing
overhead. The stopped down sky really did it. Indoor shots and close ups
of the kids and dog never did show it.

Jimmy


"Celtic Boar" <extraneous@charter.net> wrote in message
news:CLsNd.10241$t31.9749@fe04.lga...
> 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.
>
> http://webpages.charter.net/rflohr/034.jpg
>
> 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?
>
> Thanks for the help.
>
> --
> Rikk Flohr
>
> website: www.fleetingglimpse.com
> blog: http://spaces.msn.com/members/fleetingglmpse/
>
>
Anonymous
February 6, 2005 10:14:21 PM

Archived from groups: rec.photo.digital (More info?)

"Celtic Boar" <extraneous@charter.net> wrote in message
news:CLsNd.10241$t31.9749@fe04.lga...
>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.
>
> http://webpages.charter.net/rflohr/034.jpg
>
> 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
produce.

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.

C
!