Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    shobley's Avatar
    shobley is offline Main Sequence
    Points: 1,058, Level: 18
    Level completed: 58%, Points required for next Level: 42
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!2 Posts Achievement20 Posts Achievement!
    Join Date
    Feb 2012
    Location
    Indianapolis, IN
    Posts
    104
    Points
    1,058
    Level
    18
    Thanks
    15
    Thanked 14x 9 Posts

    Default Can't seem to get any improvement with stacking



    I've been photographing deep sky objects - mainly Orion Nebula an Andromeda.

    I've been taking about 10 light frames, and about 4-6 dark frames.

    But it seems that I always get more pleasing results by processing a single image in Photoshop - doing simple noise reduction, sharpening and gamma adjust.

    My camera is a Nikon DSLR (D300) that does automatic dark frame subtraction.

    Is there a trick to getting improved results through stacking? Should I under/overexpose the light frames?



    Steve

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Tesla Coils, Laser Harps and Killer Robots from Outer Space

  2. #2
    Celestron's Avatar
    Celestron is offline Raiders of The Lost Galaxy
    Points: 34,879, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    First 1000 Experience PointsGot three Friends100+ Threads Achievement!365 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Sep 2008
    Location
    Minnesota
    Posts
    2,365
    Points
    34,879
    Level
    100
    Thanks
    539
    Thanked 540x 428 Posts
    Blog Entries
    2

    Default

    With what program are you stacking them?
    ▇ ▅ █ ▅ ▇ ▂ ▃ ▁ ▁ ▅ ▃ ▅ ▅ ▄ ▅ ▇

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80 - Meade LXD-55 - Canon 1100D


  3. #3
    Phil Leigh's Avatar
    Phil Leigh is offline HYPER GIANT
    Points: 34,455, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement
    Join Date
    Nov 2011
    Location
    Cryers Hill, High Wycombe, UK
    Posts
    5,867
    Points
    34,455
    Level
    100
    Thanks
    451
    Thanked 2,018x 1,651 Posts
    Blog Entries
    8

    Default

    1) Turn off dark frame subtraction in-camera - this is important.
    2) use more light frames (what are you taking a picture of?)
    3) use Deep Sky Stacker to stack
    4) Shoot in RAW (not jpeg)

    How does that look?

    What ISO and duration are your exposures?

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    SWEquinox ED80 Pro (Schott/Ohara Fluorite)+Baader Steeltrack, C8 XLT Mount:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Pro, Rowan belt drive on Pillar mount+EQDIR+ADM saddle/dovetails Camera: JTW1100D mono , CentralDS 600, ASI120MM. ASI120MC
    , IDAS & Baader NB 2-inch filters, TS Filter Drawer System Accessories: TV Nagler T4 12 mm, Baader 8-24 MkIII, Ortho 5mm, Aspheric 31mm, Meade 12mm reticle, TV Powermate 2x & 2.5x, JMI+BAST Motorfocus+FCUSB, TV 0.8x FR/FF, Celestron 0.63FR,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    RACI & Mag Mini, Canon IS 15x50 Bins

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    EQMOD/Stellarium/Autostakkert!/Registax/BackyardEOS/PixInsight,PHD2,AlignMaster, AstroTortilla, Straton

  4. #4
    jupiterman's Avatar
    jupiterman is offline Main Sequence
    Points: 5,039, Level: 48
    Level completed: 45%, Points required for next Level: 111
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points50 Posts Achievement!5 Threads Achievement!750 Days+ Registered Achievement!
    Join Date
    Jan 2011
    Location
    SCOTLAND
    Posts
    94
    Points
    5,039
    Level
    48
    Thanks
    9
    Thanked 33x 20 Posts

    Default

    I`m getting to grips with Nebulosity for pre-processing and stacking of frames.This uses Bad Pixel Mapping rather than dark frame subtraction.As far i understand it when you take darks or flats you should aim for a minimum of 20.Adding only a few introduces more noise than than your trying to take out.I tried Deep sky Stacker and my results were not good i`m afraid and like you i had more pleasing results with single frame shots!So i`m trying out nebulosity to see if there is some improvement.

  5. #5
    Astronewb's Avatar
    Astronewb is offline HYPER GIANT
    Points: 194,311, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience PointsGot three FriendsGhost Achievement! Averaging 5+ posts a day!
    Join Date
    Sep 2011
    Location
    Canton, Connecticut, USA
    Posts
    5,621
    Points
    194,311
    Level
    100
    Thanks
    1,515
    Thanked 3,093x 2,132 Posts

    Default

    Hi Steve, on your Nikon, you should have Long Exposure Noise Reduction turned off, and High ISO Noise Reduction turned off.

    Hopefully you're shooting in RAW mode. Your imaging runs will be faster w/o NR, and that's why you take Darks. If you have NR on, you don't need to take any Darks..the camera is doing it for you. The nice think about taking Darks is that you can build up a Dark image base and use it with any post processing software. I typically have Darks ranging from 20-60 secs at ISO's 400, 800, 1600 and 3200 in my image folder. Don't forget to add Bias images, just cap the scope and shoot off a bunch of images at your camera's highest shutter speed at whatever ISO you want.

    If you took your images with NR on, then do not add any Darks when stacking in DeepSkyStacker, you don't need them.

    If you post an image, it might help sort out your problem?

    Keep looking up

    Paul
    Life's a journey, enjoy the ride
    OTA's: Borg 125SD, AR152mm, ES152mm Comet Hunter
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    xx14g , SVR90T-AP, AT6RC, AT10RC, Borg 60ED. Borg 50mm
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Mounts:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    CEM60EC, iEQ45, ZEQ25, Mini Tower Pro, SEQ Pro.
    Misc: Lots of EP's. Nikon D5100, Canon T3i, ATF2FF , GSO
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Corrector. SSAG, QHY5L-II & Lodestar
    My Flickr DSO set> https://www.flickr.com/photos/astronewb2011/sets/

  6. #6
    Celestron's Avatar
    Celestron is offline Raiders of The Lost Galaxy
    Points: 34,879, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    First 1000 Experience PointsGot three Friends100+ Threads Achievement!365 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Sep 2008
    Location
    Minnesota
    Posts
    2,365
    Points
    34,879
    Level
    100
    Thanks
    539
    Thanked 540x 428 Posts
    Blog Entries
    2

    Default

    Awesome DSS tutorial here.Image Stacking Guide
    ▇ ▅ █ ▅ ▇ ▂ ▃ ▁ ▁ ▅ ▃ ▅ ▅ ▄ ▅ ▇

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80 - Meade LXD-55 - Canon 1100D


  7. #7
    shobley's Avatar
    shobley is offline Main Sequence
    Points: 1,058, Level: 18
    Level completed: 58%, Points required for next Level: 42
    Overall activity: 0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!2 Posts Achievement20 Posts Achievement!
    Join Date
    Feb 2012
    Location
    Indianapolis, IN
    Posts
    104
    Points
    1,058
    Level
    18
    Thanks
    15
    Thanked 14x 9 Posts

    Default

    Thanks for the response - I was starting to think that the DSLR noise reduction was actually counterproductive.

    Here's one of my single images:

    Orion Nebula Focusing Problem | Flickr - Photo Sharing!

    Optics were off, so I re-collimated everything last night.

    But this a good example of the the kind of light frames I am getting.

    Steve

    P.S. I've tried Deep Sky Stacker, but this does not load D300 Nef files, after converting to TIFF it ran out of memory on a 4Gb machine trying to stack. Registax completed the stack, but the results were no different than a single frame.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Tesla Coils, Laser Harps and Killer Robots from Outer Space

  8. The Following User Says Thank You to shobley For This Useful Post:

    danman1453 (02-29-2012)

  9. #8
    Gadget63's Avatar
    Gadget63 is offline SUPER GIANT
    Points: 11,551, Level: 74
    Level completed: 34%, Points required for next Level: 199
    Overall activity: 0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement
    Join Date
    Jan 2012
    Location
    Fair Play, SC, or wherever our RV takes us
    Posts
    904
    Points
    11,551
    Level
    74
    Thanks
    100
    Thanked 166x 144 Posts

    Default

    Thanks for the image stacking guide link. I am definitely going to study that. I tried DSS and got totally lost. No matter how many pics I snapped, darks, flats, I thought I followed the instructions to the letter, when I tried to stack, I constantly got only one photo will be stacked messages.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8 SE, Heavy Duty EQ Wedge, Celestron 8mm-24mm zoom
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron eyepiece/filter accessory kit, Celestron power tank, Telrad, Nikon D80 DSLR camera with T-adapter and
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron 80mm guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron Neximage, Celestron Nexguide, Celestron CGEM-DX EQ mount!

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  10. #9
    Astronewb's Avatar
    Astronewb is offline HYPER GIANT
    Points: 194,311, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience PointsGot three FriendsGhost Achievement! Averaging 5+ posts a day!
    Join Date
    Sep 2011
    Location
    Canton, Connecticut, USA
    Posts
    5,621
    Points
    194,311
    Level
    100
    Thanks
    1,515
    Thanked 3,093x 2,132 Posts

    Default

    [quote]
    Quote Originally Posted by shobley View Post
    Thanks for the response - I was starting to think that the DSLR noise reduction was actually counterproductive.

    Here's one of my single images:
    Very nice image. You're right, you have a focus issue, double check all your attachment points to try and get straight image plane. Looks like you have some mis-alignment somewhere. But in general, you're collecting some nice data in the image. Just some fine tuning and repeatable imaging steps will get you all sorted out, ie;

    With NR and High ISO NR turned off..

    Take your lights

    Take your darks

    Take your biases

    Load them into DSS and then final process in the software program of your choice.

    Nice tutorial on DSS can be found here:

    [ame=http://www.youtube.com/watch?v=UWWaKkCUm6c&list=UUvLpugEDmDVQr1JDptAsbQg& index=10&feature=plcp]Astrophotography: Deep Sky Stacker Tutorial - YouTube[/ame]

    You're on the right track, have a bunch of fun while you're at it.

    Paul
    Life's a journey, enjoy the ride
    OTA's: Borg 125SD, AR152mm, ES152mm Comet Hunter
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    xx14g , SVR90T-AP, AT6RC, AT10RC, Borg 60ED. Borg 50mm
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Mounts:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    CEM60EC, iEQ45, ZEQ25, Mini Tower Pro, SEQ Pro.
    Misc: Lots of EP's. Nikon D5100, Canon T3i, ATF2FF , GSO
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Corrector. SSAG, QHY5L-II & Lodestar
    My Flickr DSO set> https://www.flickr.com/photos/astronewb2011/sets/

  11. #10
    Astronewb's Avatar
    Astronewb is offline HYPER GIANT
    Points: 194,311, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience PointsGot three FriendsGhost Achievement! Averaging 5+ posts a day!
    Join Date
    Sep 2011
    Location
    Canton, Connecticut, USA
    Posts
    5,621
    Points
    194,311
    Level
    100
    Thanks
    1,515
    Thanked 3,093x 2,132 Posts

    Default

    Quote Originally Posted by Gadget63 View Post
    Thanks for the image stacking guide link. I am definitely going to study that. I tried DSS and got totally lost. No matter how many pics I snapped, darks, flats, I thought I followed the instructions to the letter, when I tried to stack, I constantly got only one photo will be stacked messages.
    Hi Gadget. You don't have a problem with DSS, you have a problem with out of focus stars or stars with excessive trailing. My guess is out of focus...been there, done that. Get yourself a Bahtinov mask (or make one..just Google it for a template) and put that monster to bed.

    DSS will not stack out of focus stars...it will register them, it will go thru the whole process of subtracting darks/ bias'/ etc..until you get to the stacking phase..then, sorry...only one image will be stacked!

    Cheers

    Paul
    Life's a journey, enjoy the ride
    OTA's: Borg 125SD, AR152mm, ES152mm Comet Hunter
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    xx14g , SVR90T-AP, AT6RC, AT10RC, Borg 60ED. Borg 50mm
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Mounts:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    CEM60EC, iEQ45, ZEQ25, Mini Tower Pro, SEQ Pro.
    Misc: Lots of EP's. Nikon D5100, Canon T3i, ATF2FF , GSO
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Corrector. SSAG, QHY5L-II & Lodestar
    My Flickr DSO set> https://www.flickr.com/photos/astronewb2011/sets/

  12. The Following User Says Thank You to Astronewb For This Useful Post:

    danman1453 (02-29-2012)

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Changing barlows improvement?
    By Admiral Crispy in forum UK Astronomy Forum
    Replies: 2
    Last Post: 09-04-2011, 08:27 PM
  2. Much an improvement
    By Galactica in forum Astronomy Reports Forum
    Replies: 1
    Last Post: 05-23-2010, 05:49 PM
  3. Orion XT6 vs XT8 improvement in viewing
    By David in forum Amateur Astronomy Forum
    Replies: 14
    Last Post: 01-19-2004, 04:32 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin Version 4.2.0
Powered by vBulletin
All times are GMT. The time now is 01:46 AM.