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Old 29-05-2014, 01:19 PM
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pvelez (Pete)
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How low do you go?

I have been imaging all year with my STX16803 set at -25C.

Despite the weird weather, I think I can image at -30 or -35C.

Would this make an appreciable difference in noise? How low do you routinely go?

Pete
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Old 29-05-2014, 01:42 PM
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Joshua Bunn (Joshua)
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I think every 7 deg drop in temperature halves dark current, but i guess we are talking small amounts of noise the colder we get.

with my stl11000, i stay at -20 all year round. in winter i could go to -30 to -35, its a matter of making another set of darks. i find dithering and a bad pixel map cleans things up very cleanly.

josh
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Old 29-05-2014, 01:51 PM
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Thanks Josh

looks like a bad pixel map is the next task - which means delving into PI again

Pete
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Old 29-05-2014, 01:53 PM
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Thanks Josh

looks like a bad pixel map is the next task - which means delving into PI again

Pete
CCDstack has one to.
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Old 31-05-2014, 02:30 PM
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As does Nebulosity.
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Old 31-05-2014, 04:04 PM
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I run my STXL at -30C and the QSI683 at -25 all year round. The STXL handles hot weather easily, but the QSI needs a drop of 5 degrees on warm nights in summer. So I generally don't image those nights.
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Old 01-06-2014, 05:43 AM
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Thanks Josh

looks like a bad pixel map is the next task - which means delving into PI again

Pete
In PI, CosmeticCorrection is easier to use than DefectMap. Harry describes it in his video on BatchPreprocessing.
Geoff
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