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Spots on my New Rebel XT / 350D Pictures

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Tom Z

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I have only had my camera a week and I noticed something strange in the blue sky. I thought they were spots on the sensor, but I took picture without the lens and they seem to go away. I have tried both of my lens and they produce the spots in the same spots.

Could it be dust or spots on the sensor even though I don't see it without a lens?

It seems to be worse with the longer exposure times.

Picture taken without a lens at 1/4000 at 100 ISO:



Picture taken at 1/2000 at 1600 ISO:



Picture taken at 1/25 at 100 ISO:



--
Tom

http://www.tzphotos.com
 
Tom Z said:
Could it be dust or spots on the sensor even though I don't see it
without a lens?
Click to expand...
Absolutely. Those are classic examples of dust on the sensor.

The smaller the aperture, the clearer the spot. With no lens the aperture is huge and you won't see them.
 
Definitely dust bunnies on your sensor. My camera had them within the first 24 hours after I received it. Be careful when changing out lenses as this will cause more dust build up faster than anything. The dust cleans off easily enough though. Do a search on techniques for how to clean it. There are many different methods, some including taking your camera into an authorized dealer and spending $80.00 or so to have them clean it for you. I personally prefer to clean it myself.
--
Oak & Acorn

 
oh why, oh why doesn't Canon have sensor cleaning technology ?

I mean they took the industry by storm when they had the first sub $1k camera (with lense!) with the DRebel/300D... but I feel they are falling behind some competitors...

even nikon has much less expensive entry DSLR and some interesting zooms... others have cleaning sensors, or IS built into the body (instead of spending $300+ extra per lens... yeah yeah I know those are supposed to be better...)

instead canon comes off with $2100 f1.2 lense most people would never use, and barely update the 20D. geeehhhh...
 
Everyone,

Thank you for all the help. I thought I was being very carefull while changing the lens by holding the camera face down so dust doesn't fall into the mirror box.

Is there a certain way I should hold the camera while changing the lens, so I don't have a problem?

I will have to start to search for some kind of cleaning option for the camera.

Thanks again,
--
Tom

http://www.tzphotos.com
 
Well I was doing that too and I wondered if dust that was floating up from the ground (particularly if outside) in slight breeze etc was just going into it. The best method I've found is to face the camera inward toward your stomach and angle down slightly.

--
Michelle
---------------------------------
Through my Lens
http://canon350.blogspot.com/
 
Hold the camera facing down , loosin the cap on the lens that you are going to put on the camera before you take off the lens that is on the camera. Take the lens off the camera , put lens cap on the lens that you just took off the camera, pick up the new lens and install it on the camera. The quicker you change the lenses the less chance for dust to enter the camera. Now pick up the loose lens and secure it in your camera bag. Job well done. Or as George W. Bush would say, "MISSION ACCOMPLISHED!"
Have a good day.
 
--
Rick
 
Tom Z said:
I have only had my camera a week and I noticed something strange in
the blue sky. I thought they were spots on the sensor, but I took
picture without the lens and they seem to go away. I have tried
both of my lens and they produce the spots in the same spots.

Could it be dust or spots on the sensor even though I don't see it
without a lens?

It seems to be worse with the longer exposure times.

Picture taken without a lens at 1/4000 at 100 ISO:



Picture taken at 1/2000 at 1600 ISO:



Picture taken at 1/25 at 100 ISO:



--
Tom

http://www.tzphotos.com
Click to expand...
--
Jürgen aus Boden, Schweden.
 
Tom Z said:
I think I am going to give the "Copper Hill cleaning method" a try.

Thanks again everyone,
--
Tom

http://www.tzphotos.com
Click to expand...
Good luck on the sensor cleaning. I started the Copper hill cleaning with my 300d. I have had my 350d for a month now and havent had to clean yet. Read the directions carefully and only one drop of eclipse on the pad at once. If you didn't already know... To see the sensor dust "better", take a shot of a blue sky at f/22(or smallest aperture with your lens). You will see some dust spots, but open the file in PS and run AutoLevels, this will show the detail of the sensor dust. Below are shots from my first sensor cleaning, It was night time, so I took shots of a white kitchen cabinet under bright light for the test shots.

First shot after autolevels(gives it this discoloration)



After less than 10minutes cleaning(total of 4 swipes of sensor)

 
Tom Z said:
I think I am going to give the "Copper Hill cleaning method" a try.
Click to expand...
Why touch the sensor (actually it's the anti-aliasing filter in front of the sensor) if you don't have to, try a blower first - maybe that'll be enough. If not, then try another more aggressive cleaning method.

--
Good Day,
Roonal
 
If your going to use a blower make sure you use a good strong blower(but still hand pump ) Usually the kind with the little brush on the end are useless. In fact, I havent had much luck at all with blowers. Gets some dust off but not all. Usually just blows the dust around in the chamber and a few shots later its all back on the sensor.

I havent tried it yet but some swear that using a small nylon brush (certain types of makeup brushes are what they are using) and blow compressed air accross it for 20 secs which essentially applies a static charge. Then open up your mirror and a quick stroke across your sensor is all thats required.

You have too look this up on the net as you have to use a very specific type of brush.

The methanol and pad method does work well but it takes practice and most times its overkill. Its essential on stubborn stuck dust.
 
http://www.prime-junta.net/pont/How_to/a_Brush_Your_Sensor/a_Brush_Your_Sensor.html?page=1

--
Good Day,
Roonal
Nomad_68 said:
Nomad_68 said:
I havent tried it yet but some swear that using a small nylon brush
Click to expand...
(certain types of makeup brushes are what they are using) and blow
compressed air accross it for 20 secs which essentially applies a
static charge. Then open up your mirror and a quick stroke across
your sensor is all thats required.
You have too look this up on the net as you have to use a very
specific type of brush.
Click to expand...
 
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