#1  
Old 07-02-2011, 04:16 PM
supernova1965's Avatar
supernova1965 (Warren)
Buddhist Astronomer

supernova1965 is offline
 
Join Date: Aug 2009
Location: Phillip Island,VIC, Australia
Posts: 4,073
Deepsky Stacker Question

Hi all

I took 4 ten sec exposures of Orion unguided just a camera no scope on a tripod. I know 4 isn't enough but I am trying to dip my toe in I tried to run them through Deep Sky Stacker and it couldn't stack the images these are the jpg's I was trying to stack .NEF it was processing them no problems using Deepsky stacker live but after the run it had only "Stacked" one image. Any idea's

The info from the photo's are as follows

Device: Nikon D200
Lens: 18-135mm F/3.5-5.6G
Focal Length: 80mm
Focal Mode: Manual

Apeture F/5.6
Shutter Speed 10s
Exposure Mode Manual
Exposure Comp OEV
ISO Sensitivity 1EV over 1600

Raw .NEF
Attached Thumbnails
Click for full-size image (DSC_8157.JPG)
174.9 KB16 views
Click for full-size image (DSC_8158.JPG)
160.9 KB10 views
Click for full-size image (DSC_8159.jpg)
18.5 KB10 views
Click for full-size image (DSC_8160.jpg)
18.2 KB9 views
Reply With Quote
  #2  
Old 07-02-2011, 04:21 PM
TrevorW
Registered User

TrevorW is offline
 
Join Date: Aug 2006
Posts: 6,995
Warren the exposures are probably way to short for DSS to register any stars, check that you have the setting for this at 2% if it doesn't pick them up then then definitely to short
Reply With Quote
  #3  
Old 07-02-2011, 04:48 PM
supernova1965's Avatar
supernova1965 (Warren)
Buddhist Astronomer

supernova1965 is offline
 
Join Date: Aug 2009
Location: Phillip Island,VIC, Australia
Posts: 4,073
Thanks Trevor

Am I wrong in thinking that 10s is the longest exposure that I can do before trailing occurs.

So I can't do this kind of close up unguided is that right I should stick to wide field untill I have a guided mount
Reply With Quote
  #4  
Old 07-02-2011, 06:20 PM
tlgerdes's Avatar
tlgerdes (Trevor)
Love the moonless nights!

tlgerdes is offline
 
Join Date: Mar 2009
Location: Sydney
Posts: 2,280
It can work, my first pic was 20 x 8 secs with a Ricoh Caplio R7.
Reply With Quote
  #5  
Old 07-02-2011, 06:22 PM
tlgerdes's Avatar
tlgerdes (Trevor)
Love the moonless nights!

tlgerdes is offline
 
Join Date: Mar 2009
Location: Sydney
Posts: 2,280
Quote:
Originally Posted by supernova1965 View Post
Thanks Trevor

Am I wrong in thinking that 10s is the longest exposure that I can do before trailing occurs.
It depends on the focal length you are shooting at, < 50mm you should be able to go 30sec without too much problem
Reply With Quote
  #6  
Old 07-02-2011, 06:29 PM
tlgerdes's Avatar
tlgerdes (Trevor)
Love the moonless nights!

tlgerdes is offline
 
Join Date: Mar 2009
Location: Sydney
Posts: 2,280
Based on the pics you have posted, the problem appears to be not enough stars to register a pic.

I get 15, 5, 9 and 6 stars.

Also looks a bit out of focus, you usually have to wind it in a fraction from infinity to find focus.
Reply With Quote
  #7  
Old 07-02-2011, 06:58 PM
supernova1965's Avatar
supernova1965 (Warren)
Buddhist Astronomer

supernova1965 is offline
 
Join Date: Aug 2009
Location: Phillip Island,VIC, Australia
Posts: 4,073
Quote:
Originally Posted by tlgerdes View Post
Based on the pics you have posted, the problem appears to be not enough stars to register a pic.

I get 15, 5, 9 and 6 stars.

Also looks a bit out of focus, you usually have to wind it in a fraction from infinity to find focus.

I am having some problem focusing with all the light polution. When I am looking through the camera I can't see the stars too well for focusing and auto focus is no good it doesn't seem to work and I don't have a remote shutter yet so I am holding the cardboard over the lens so I can remove it when the shutter shake is finished.
Reply With Quote
  #8  
Old 07-02-2011, 07:16 PM
tlgerdes's Avatar
tlgerdes (Trevor)
Love the moonless nights!

tlgerdes is offline
 
Join Date: Mar 2009
Location: Sydney
Posts: 2,280
When I first tackled this, I set the exposure time to 8 secs and then told it to do a timer shutter release. Then I hit the shutter button and 5 sec later it took a photo after all the vibration subsided.

Things to remember, if you stop the aperture down you will also increase the depth of field, hence make focus more forgiving. Try setting aperture to around F7 and then wind out focus to infinity then pull focus back about 1/10 of a turn.

You should be able to set you expose to up to 30sec in 5 sec increments, then use the timer function to set off the exposure.
Reply With Quote
  #9  
Old 07-02-2011, 07:39 PM
supernova1965's Avatar
supernova1965 (Warren)
Buddhist Astronomer

supernova1965 is offline
 
Join Date: Aug 2009
Location: Phillip Island,VIC, Australia
Posts: 4,073
Quote:
Originally Posted by tlgerdes View Post
When I first tackled this, I set the exposure time to 8 secs and then told it to do a timer shutter release. Then I hit the shutter button and 5 sec later it took a photo after all the vibration subsided.

Things to remember, if you stop the aperture down you will also increase the depth of field, hence make focus more forgiving. Try setting aperture to around F7 and then wind out focus to infinity then pull focus back about 1/10 of a turn.

You should be able to set you expose to up to 30sec in 5 sec increments, then use the timer function to set off the exposure.
I forgot all about the timer function
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 06:38 AM.

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