Atik Cameras Forum

Support (Please note, this is primarily a user forum, for direct Atik support, please email support@atik-cameras.com) => 3- and 4-Series Cameras => Topic started by: wangwill on July 12, 2012, 08:25:08 pm

Title: Circles in the flat images
Post by: wangwill on July 12, 2012, 08:25:08 pm

Hi,

I have an Atik 314L. I tried to take some flat images today, however 2 big circles were found in every images. Anybody know the reason?

As you see in the attached image. I think the white arrow is the dust on the ccd, what is the black arrow?

Additionally, how to remove the dust on the ccd? The ccd seems to be sealed.

Thanks in advance.

Best wishes.

(http://)

Title: Re: Circles in the flat images
Post by: bwa on July 13, 2012, 01:50:55 am

If it is dust somewhere in your light train, flats should remove it.

bwa

Title: Re: Circles in the flat images
Post by: wangwill on July 13, 2012, 11:40:08 am

Thanks, bwa

Best wishes.

Title: Re: Circles in the flat images
Post by: joelshort on July 13, 2012, 08:24:59 pm

The larger the dust circle on the flat, the further away from the CCD it is.  Take a look at your filters or your objective lens/mirror.  But a little dust is no big deal and the whole purpose of flats is to correct for dust and other issues.

Title: Re: Circles in the flat images
Post by: wangwill on July 15, 2012, 09:20:40 am

Thanks, joelshort. If it is due to dust, not a big issue.