#1  
Old 10-11-2018, 08:49 PM
netwolf's Avatar
netwolf
Registered User

netwolf is offline
 
Join Date: Jan 2005
Posts: 2,906
Help - Halo in Widefield Milyway shot 50mm

Hi all

hope this is the right place to post this.

I was out imaging with my Nikion D600 using a 50mm f1.4g lens, 20 x 10sec at F2.8 ISO 500, on tripod no tracking stacked with Sequator. Just discovered Sequator after previously giving up on this data (that was a mistake as this has loads of detail). Taken Sunday 4th November 830pm from my west facing balcony loads of LP.

Now I see this Halo could have been dew I suppose not sure.

Thanks for any help.
Attached Thumbnails
Click for full-size image (test_DxO (Medium).jpg)
136.9 KB35 views
Reply With Quote
  #2  
Old 10-11-2018, 09:47 PM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 6,339
Looks a bit like over correcting flats.
Have you calibrated them?
Reply With Quote
  #3  
Old 10-11-2018, 09:58 PM
netwolf's Avatar
netwolf
Registered User

netwolf is offline
 
Join Date: Jan 2005
Posts: 2,906
Thx Colin but no flats or darks just lights. I thought artifact of Sequator but even in the RAW with curves on single frame I can see the halo come out.
Reply With Quote
  #4  
Old 10-11-2018, 10:26 PM
beren's Avatar
beren
Registered User

beren is offline
 
Join Date: Oct 2004
Location: WA
Posts: 2,767
Are you using a light pollution filter like a IDAS on the lens ? I get similar artefacts when using mine on wider lens ( think they recommend lens over 90mm)
Reply With Quote
  #5  
Old 11-11-2018, 12:42 AM
netwolf's Avatar
netwolf
Registered User

netwolf is offline
 
Join Date: Jan 2005
Posts: 2,906
no filters. could it be dew ?

I have used this lens before in a more open space on the ground and it's been fine. Here I am on a balcony. i also see similar artifacts on my 24-70mm shots at 24mm on that night.

Tamron 24-70 f2.8 at 24mm f4 ISO 79 16x15seconds stacked in Squator and then i just did some adjustments in DXO to bring out the rings.
Maybe some odd reflections from my balcony??
Attached Thumbnails
Click for full-size image (MWTamron_DxO (Medium).jpg)
131.5 KB17 views

Last edited by netwolf; 11-11-2018 at 12:56 AM.
Reply With Quote
  #6  
Old 11-11-2018, 11:12 AM
Peter Ward's Avatar
Peter Ward
Galaxy hitchhiking guide

Peter Ward is offline
 
Join Date: Dec 2007
Location: The Shire
Posts: 6,667
Was it cold? Looks like condensation to me, possibly on the sensor itself.

If this always happens, then Id try mixing things up a bit, e.g. trying a different lens, adding a lens hood etc. to track down the cause.
Reply With Quote
  #7  
Old 11-11-2018, 02:43 PM
netwolf's Avatar
netwolf
Registered User

netwolf is offline
 
Join Date: Jan 2005
Posts: 2,906
Quote:
Originally Posted by Peter Ward View Post
Was it cold? Looks like condensation to me, possibly on the sensor itself.

If this always happens, then Id try mixing things up a bit, e.g. trying a different lens, adding a lens hood etc. to track down the cause.
Peter you might be right, i was changing lenses outisde. As i recall i was a cooler night.
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 06:22 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Celestron Australia
Advertisement
Bintel
Advertisement
OzScopes Authorised Dealer
Advertisement
NexDome Observatories
Advertisement
Meade Australia
Advertisement
Lunatico Astronomical
Advertisement
SkyWatcher Australia
Advertisement
Astronomy and Electronics Centre
Advertisement