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bad cols - how many is too many?

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#1 prefetch

prefetch

    Viking 1

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Posted 15 August 2019 - 06:14 PM

i've had my ML16803 for about 5 years now and i've noticed this year that new bad columns keep popping up.

 

here's my current cosmetic correction list from pixinsight:

 

1802

322

543

1011

1135

3604

442

746

889

747

1179

202

1033

2038

 

it seems like PI is able to do an okay job on corrections (14 out of 2048 (binning) is a pretty small percentage) and hopefully my CCD lasts for many more years to come - but it got me thinking, at what point do you "retire" a CCD because of bad columns?  

 

how many bad columns do you have on your sensor?



#2 Jim Waters

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Posted 15 August 2019 - 06:59 PM

It would be a subjective call.  When you get to the point where its causing noticeable image degradation -or- its starts to aggravate you too much during processing or both...


Edited by Jim Waters, 15 August 2019 - 07:07 PM.


#3 Terry R

Terry R

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Posted 15 August 2019 - 07:10 PM

That's not bad at all really.  This is why we calibrate.  I use a STL-11000 and certainly have many columns with issues.  Jim's call is best, when it starts to aggravate you too much or you can't control their effects any more.




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