#1  
Old 29-05-2014, 01:19 PM
pvelez's Avatar
pvelez (Pete)
Registered User

pvelez is offline
 
Join Date: Aug 2006
Location: Sydney
Posts: 1,250
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
Reply With Quote
  #2  
Old 29-05-2014, 01:42 PM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,459
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
Reply With Quote
  #3  
Old 29-05-2014, 01:51 PM
pvelez's Avatar
pvelez (Pete)
Registered User

pvelez is offline
 
Join Date: Aug 2006
Location: Sydney
Posts: 1,250
Thanks Josh

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

Pete
Reply With Quote
  #4  
Old 29-05-2014, 01:53 PM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,459
Quote:
Originally Posted by pvelez View Post
Thanks Josh

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

Pete
CCDstack has one to.
Reply With Quote
  #5  
Old 31-05-2014, 02:30 PM
allan gould's Avatar
allan gould
Registered User

allan gould is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 4,485
As does Nebulosity.
Reply With Quote
  #6  
Old 31-05-2014, 04:04 PM
Paul Haese's Avatar
Paul Haese
Registered User

Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 9,937
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.
Reply With Quote
  #7  
Old 01-06-2014, 05:43 AM
Geoff45's Avatar
Geoff45 (Geoff)
PI rules

Geoff45 is offline
 
Join Date: Jul 2006
Location: Sydney
Posts: 2,631
Quote:
Originally Posted by pvelez View Post
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
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 02:51 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement