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Old 09-06-2007, 23:12   #1 (permalink)
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Help, I have a blob!

Perhaps a silly (or frequently asked) question, but as a newbie I hope I'll be forgiven!

I appear to have a blob. A blob which appears on all pictures regardless of lens. Therefore I assume my blob is on my sensor? My blob appears in top right (landscape orientation) of all pictures, more noticable in some than others, but is pretty noticable on the majority of shots.

Example (showing as darker grey 'half-moon/arc' in top right):


And 100% crop of said blob from picture above:


Would my blob be dust, or could it be a smeary type blob? Either way, help! I have read the camera sensor cleaning instructions and I have to admit to not being filled with confidence.

The camera is Canon 20d.



Thanking you advance.
Ali

Last edited by Ali; 09-06-2007 at 23:24. Reason: Didn't make sense!
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Old 09-06-2007, 23:32   #2 (permalink)
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Re: Help, I have a blob!

looks lke a hair! im sure there are are loads of folk who will give u good valuable advice in regard to cleaning the sensor....... i have a couple of dots ( already) on mine but its on the mirror so doesnt appear on the photos!

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Old 10-06-2007, 04:12   #3 (permalink)
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Re: Help, I have a blob!

I have a 20d and have seen the same blob. I blew mine off the sensor by setting my camera on a try pod facing down at about 45 degrees, set to P mode on the dial and selected senor clean on the menu. It opened up the sensor and I used an "ear syringe" and blew a couple of big blasts of air without touching the sensor with the syringe. I then turned the camera off to close the cover over the sensor. It was the biggest syringe I could find, 3oz. If I could find a bigger one I would use it. This kind of dust should blow right off..
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Old 10-06-2007, 12:17   #4 (permalink)
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Re: Help, I have a blob!

I have had a 20D for over 2 years now. There was no dust visble for the first 6 months and for the following 12 months I just used the Giotto Rocket Blower (about 6) to blow away dust. After about 20 months the dust would not blow away which is probably because it is pollen which sticks to the sensor. I purchased a Digipad cleaning kit (swabs plus fluid) and this worked very well. The supplier and many of the large internet retailers provide clear instructions. You need to be more careful about the cleaning fluid with an EOS 5D as the surface coating of the sensor is different but there are solutions now.

Please do not clean your sensor because I have but, if you are reasonably confident, it is not difficult. Do use the right equipment. The Giotto Rocket will not suck in the dust and blow it back on the sensor and the DigiPads and Ecclipse fluid are designed to clean digital sensors (there are other suitable products but I have not used them).
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Old 10-06-2007, 13:09   #5 (permalink)
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Re: Help, I have a blob!

Thank you! I think I have successfully removed my blob

Mounted on tripod as suggested and followed the Sensor Cleaning instructions in the manual (remove lens, switch to <ON>, use blower, switch off).

A few good puffs with the blower seem to have removed whatever it was.
Had it not, I'm not sure I am brave enough to try the Digipad kit, but luckily all seems clear again. Hopefully I won't have to do that too often!

A nice clear sky



Thanks again for all your help.
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Old 12-06-2007, 16:00   #6 (permalink)
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Re: Help, I have a blob!

Well done! Also, if you get another, I know it's annoying but you could save yourself the fright by just using a healing tool (photoshop), or similar, to get rid of it unnoticably!
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Old 12-06-2007, 18:30   #7 (permalink)
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Re: Help, I have a blob!

Ali, well done! As JMitchell has said, you do not need to worry about the odd bit of dust if you use Elements or PhotoShop as you can remove with the healing brush. Inevitably the amount of dust will build up over time particularly if you frequently changes lenses as I do. However, don't be too concerned as you now know it is possible to deal with it.
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Old 12-06-2007, 18:56   #8 (permalink)
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Re: Help, I have a blob!

Quote:
Originally Posted by Ali View Post
A nice clear sky

actually your sensor is still quite dirty. I won't show u tho as it's very depressing. well unless u insist
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Old 12-06-2007, 21:22   #9 (permalink)
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Re: Help, I have a blob!

OP is right, I can also see your dust spec's ... I know what to look for, as I have some on mine as well
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Old 13-06-2007, 09:39   #10 (permalink)
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Re: Help, I have a blob!

I thought I could spot them, but then realised it was computer screen!

I think I can see a couple over on the left had side above the cloud, but if you'd like to put me out my misery please do. But if it's really depressing news, perhaps not...
Another blast with the blower do you think, or does this mean it's time for the Digipad kit?

I was quite giddy at having got rid of the big blob, I didn't really take much notice of the others.

I was looking around other topics yesterday and it was mentioned there was a tutorial written for sensor cleaning but I cannot find it. Can anyone point me in the right direction?

Thank you for the healing tool tip
I am slowly finding my way round Elements 5, although atthe same time pondering if I really should be looking at CS2. Another question for another day perhaps?

Thanks again for your help and input!

Last edited by Ali; 13-06-2007 at 09:46. Reason: Spelling
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Old 13-06-2007, 17:26   #11 (permalink)
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Re: Help, I have a blob!

Quote:
Originally Posted by Ali View Post
I was looking around other topics yesterday and it was mentioned there was a tutorial written for sensor cleaning but I cannot find it. Can anyone point me in the right direction?
Seek, and you will find! Top of second page in the tutorials forum.
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Old 13-06-2007, 19:06   #12 (permalink)
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Re: Help, I have a blob!

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Seek, and you will find! Top of second page in the tutorials forum.
Oh thank you!
I was looking in the wrong place I was looking in the Articles & Tutorials section.

Cheers!
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Old 14-06-2007, 08:12   #13 (permalink)
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Re: Help, I have a blob!

Quote:
Originally Posted by Ali View Post
I think I can see a couple over on the left had side above the cloud, but if you'd like to put me out my misery please do.
Ask and ye shall get.



Now the image isn't ideal. Had to crop out the trees as they'd affect the manipulation. And the white clouds + blue sky isn't ideal either.

Paraphrased from Steve: -
Set your aperture to F22 go to manual focus and shoot at a light uniform colour object. Blue sky is ideal.

Next take your image into photoshop and set the levels to auto.

That should let you see all those nasty wabbits.
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