#1  
Old 29-06-2017, 08:41 AM
vlazg's Avatar
vlazg (George)
Registered User

vlazg is offline
 
Join Date: May 2014
Location: Darwin
Posts: 737
Help with images


Last night i began an imaging session using SGPro. I had set up to take 9 images RGB in that order, 5minutes, and after a few went and had a nap
( why is it if you dont fall asleep everything goes ok but if you fall asleep everything goes haywire)
When i examined the images , the R was fine and the first 4 of the G were ok and the pattern shown in the thumbnails ( 5 to 9) appeared but strangely enough exactly the same happened with the blue, the first 4 were ok and exactly the same pattern occured , ie images 5 to 9 had the same pattern.

Any ideas? A software glitch or something more sinister.

Any help would be appreciated.

Thanks

George
Attached Thumbnails
Click for full-size image (4.jpg)
63.5 KB20 views
Click for full-size image (6.jpg)
64.6 KB23 views
Click for full-size image (7.jpg)
66.0 KB20 views
Click for full-size image (8.jpg)
67.4 KB21 views
Click for full-size image (9.jpg)
69.5 KB28 views
Reply With Quote
  #2  
Old 29-06-2017, 08:53 AM
billdan's Avatar
billdan (Bill)
Registered User

billdan is offline
 
Join Date: Mar 2012
Location: Narangba, SE QLD
Posts: 1,551
Gooday George,

That looks like the classic signs of dew forming on the cold CCD window.

You will need a dew heater wrapped around the spacer between the CCD and the Filter wheel.

Cheers
Bill
Reply With Quote
  #3  
Old 29-06-2017, 08:54 AM
Slawomir's Avatar
Slawomir (Suavi)
Registered User

Slawomir is offline
 
Join Date: Sep 2014
Location: North Queensland
Posts: 3,240
I agree with Bill - something's fogging up to my eye.
Reply With Quote
  #4  
Old 29-06-2017, 09:05 AM
vlazg's Avatar
vlazg (George)
Registered User

vlazg is offline
 
Join Date: May 2014
Location: Darwin
Posts: 737
Quote:
Originally Posted by Slawomir View Post
I agree with Bill - something's fogging up to my eye.
Quote:
Originally Posted by billdan View Post
Gooday George,

That looks like the classic signs of dew forming on the cold CCD window.

You will need a dew heater wrapped around the spacer between the CCD and the Filter wheel.

Cheers
Bill
Ok, Thanks Bill and Suavi, that is an option but why did the pattern appear from 5 to 9 in the green, miraculously disappear when it changed to the blue filter, and began to reappear in the same order and pattern images 5 to 9, the dew would not disappear then reform in the exact same manner.???
Reply With Quote
  #5  
Old 29-06-2017, 09:16 AM
billdan's Avatar
billdan (Bill)
Registered User

billdan is offline
 
Join Date: Mar 2012
Location: Narangba, SE QLD
Posts: 1,551
Good question, maybe the cold of the CCD window is being transmitted onto the filters and it takes a bit of time to attract the dew, that why it only shows on subs 5 -9.
Reply With Quote
  #6  
Old 29-06-2017, 09:21 AM
vlazg's Avatar
vlazg (George)
Registered User

vlazg is offline
 
Join Date: May 2014
Location: Darwin
Posts: 737
OK, i will try a dew heater next time, the camera is screwed directly to the filter wheel, is it ok to put the dew heater on the camera extension , will it affect sensor cooling?
Reply With Quote
  #7  
Old 29-06-2017, 09:26 AM
DJScotty's Avatar
DJScotty (Scott)
Registered User

DJScotty is offline
 
Join Date: Aug 2013
Location: Brisbane
Posts: 677
Is sgp taking complete runs of each channel or switching between filters each shot?
Does that make sense?
Reply With Quote
  #8  
Old 29-06-2017, 09:35 AM
vlazg's Avatar
vlazg (George)
Registered User

vlazg is offline
 
Join Date: May 2014
Location: Darwin
Posts: 737
Quote:
Originally Posted by DJScotty View Post
Is sgp taking complete runs of each channel or switching between filters each shot?
Does that make sense?
Yeah Scotty, i thought of that but it is making complete runs before filter change
Reply With Quote
  #9  
Old 29-06-2017, 09:37 AM
billdan's Avatar
billdan (Bill)
Registered User

billdan is offline
 
Join Date: Mar 2012
Location: Narangba, SE QLD
Posts: 1,551
The peltier cooler is behind the sensor so a dew heater on the camera throat will not affect it.
Good question by Scotty, if SGP is taking sequences RGB in rotation order that could also explain why it takes up to subs 5 - 9 to show up on each colour.
Reply With Quote
  #10  
Old 29-06-2017, 09:43 AM
vlazg's Avatar
vlazg (George)
Registered User

vlazg is offline
 
Join Date: May 2014
Location: Darwin
Posts: 737
Quote:
Originally Posted by billdan View Post
The peltier cooler is behind the sensor so a dew heater on the camera throat will not affect it.
Good question by Scotty, if SGP is taking sequences RGB in rotation order that could also explain why it takes up to subs 5 - 9 to show up on each colour.
Thanks Bill, i answered Scotts question..... complete runs, but i really think you and Suavi are right , before nap no dew, after nap it was quite dewy.
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 09:26 PM.

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