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by **phillipb** on Thu Mar 31, 2005 9:05 pm

I was cleaning the CCD tonight and each time I found that different dust bunnies were showing up after each clean. Nothing unusual about that, it happens to me all the time.
What I did find unusual is that after cleaning the ccd and taking a test photo, if I took a second test photo the spots had changed.
Has anyone else noticed this?

by **birddog114** on Thu Mar 31, 2005 9:08 pm

PhillipB,
Use the blower to blow the dust speck first, what you have done is moved the dust bunnies around the CCD.

by **phillipb** on Thu Mar 31, 2005 9:15 pm

Birddog, Im sure you're right in what you say, but why is it that in all the subsequent test photos the spots stay in the same place, they are only different between the first and second photo after the cleaning?

by **Alex** on Thu Mar 31, 2005 9:17 pm

I think your 2nd observation is to do with mirror and shutter moving when you do exposure and dust gets moved around,carried by airflow created by moving parts.

Just my thoughts on this.

Alex

by **birddog114** on Thu Mar 31, 2005 9:22 pm

phillipb wrote: but why is it that in all the subsequent test photos the spots stay in the same place, they are only different between the first and second photo after the cleaning?

On your first post, you did not mentioned this

My thought is: the dust bunnies are now loosen and the shutter flap make them enjoying running around and playing cat & mouse game. :wink: