1. OCAU Merchandise now available! Check out our 20th Anniversary Mugs, Classic Logo Shirts and much more! Discussion here.
    Dismiss Notice

EOS 300D on a 10 inch telescope

Discussion in 'Photography & Video' started by tornado33, Aug 20, 2005.

  1. tornado33

    tornado33 Member

    Joined:
    Mar 31, 2003
    Messages:
    6,989
    Location:
    Newcastle
    Howdy.
    Ive been using my 10 inch telescope (focal length 1400 mm) as a 1400mm lens by attaching my EOs 300D directly to the telescope and shooting through it. The skies arent very dark in suburban newcastle, so I tried using a nebula filter that blocks out much of the unwanted "light pollution" but allowing most of the light of specific colours that astronomical nebulae give off.
    heres a shot of the Eagle Nebula
    http://www.users.on.net/~josiah/baader/Eagle baadersmall.jpg
    Its 2 ISO 1600 shots each of 15 minutes duration then stacked together using Photoshop CS. The nebula filter makes a big difference. I then use Levels in Photoshop to make the sky nice and dark.

    The Eta Carina Nebula http://www.users.on.net/~josiah/baader/Etacarina 2x15iso800baadersmall.jpg

    The Lagoon Nebula http://www.users.on.net/~josiah/baader/Lagoon deep_filtered2.jpg

    The Triffid Nebula http://www.users.on.net/~josiah/baader/triffid1hour_filteredsmall.jpg

    The Helix nebula http://www.users.on.net/~josiah/baader/combohelix_filteredsmall.jpg

    My telescope is nearly 20 years old. When I bought it I never dreampted there would be cameras I could attach to it that could get images like these, especially from the light polluted skies of Newcastle.
     
  2. Gibbon

    Gibbon grumpy old man

    Joined:
    Jun 30, 2001
    Messages:
    5,907
    Location:
    2650
    Awesome, absolutely awesome :D
     
  3. bubbablair

    bubbablair Member

    Joined:
    Jul 17, 2002
    Messages:
    1,228
    Location:
    The Shire, Sydney
    They are really good, thanks for sharing :)

    Bubba
     
  4. sir_bazz

    sir_bazz Team Papparazi

    Joined:
    Jun 27, 2001
    Messages:
    9,769
    Location:
    Mentone, Vic.
    Excellent stuff!

    Thanks for posting.

    bazz.
     
  5. OP
    OP
    tornado33

    tornado33 Member

    Joined:
    Mar 31, 2003
    Messages:
    6,989
    Location:
    Newcastle
    thanks for the compliments, happy to share them :)
     
  6. EvilGenius

    EvilGenius Member

    Joined:
    Apr 26, 2005
    Messages:
    10,630
    Location:
    elsewhere
    Um, probably a stupid question, but, doesn't the night sky move? How do you keep the telescope pointed at the right spot for 15mins? Just curious, because I have dreamt of being able to do that. :thumbup:
     
  7. Modafroman

    Modafroman Member

    Joined:
    Jul 10, 2002
    Messages:
    10,057
    Location:
    Brisbane
    that is absolutely spectacular :D :thumbup: :thumbup: :thumbup:
     
  8. demon777

    demon777 Member

    Joined:
    Oct 3, 2004
    Messages:
    78
    Location:
    Sydney
    holy

    brilliant stuff!! :D :D
     
  9. Tyrael

    Tyrael Member

    Joined:
    Jun 27, 2001
    Messages:
    475
    Location:
    Cairns, QLD
    All the color is just the splatted bugs on the end of the Telescope :D

    Great effort by the way, thanks for shareing. I presume you have one of those really cool telescopes that move with the sky? I'd love to be able to give this a go...
     
  10. theicemagic

    theicemagic Member

    Joined:
    Aug 6, 2001
    Messages:
    3,964
    Location:
    Melbourne, Australia
    You can buy mounts that rotate, and adjust itself to the orbit/rotation of Earth. They're not cheap, but if you're into it, it's hardly a cost you can complain about when you get results like that. They have a name, I can't remember though.

    May I ask, how did you mount it to the telescope? I've always wanted to try this, but never knew how to go about mounting it to a telescope.
     
  11. OP
    OP
    tornado33

    tornado33 Member

    Joined:
    Mar 31, 2003
    Messages:
    6,989
    Location:
    Newcastle
    Howdy
    I should have posted a pic of my scope, here it is
    http://www.users.on.net/~josiah/focuser/IMG_9932.jpg
    The power lead goes to a small synchronous motor that drives a worm that drives the white worm wheel round once each 24 hours. To overcome small irregularities in the drive, I need to constantly "guide" the scope by looking thru a eyepiece with red illuminated crosshairs, keeping a star centred, if it drifts I press either a slow or fast button to adjust the speed of the drive, and keep doing this for the duration of the exposures. More fancier (and expensive) systems have autoguiders where a CCD chip does the guiding, sending commands to adjust the drive as required.

    The camera goes on where the large black eyepiece is, I guide through the smaller second one above it. The unit can be rotated to find a suitable guide star. The accuracy to get good shots is around 1/1000th of a degree of rotation.
     
  12. OP
    OP
    tornado33

    tornado33 Member

    Joined:
    Mar 31, 2003
    Messages:
    6,989
    Location:
    Newcastle
    I forgot to mention, I use a standard T adaptor ring (available from camera stores) for EOS cameras, and a adaptor that screws into that, and goes into the telescope focuser. It has a 2 inch diameter filter thread in it for the nebula filter.
     
  13. stewpot

    stewpot Member

    Joined:
    Sep 2, 2001
    Messages:
    1,306
    Location:
    NW Tas
    Are these a crop, or is that the full image from the camera? Just trying to get a handle on the field of view occupied by these guys.
     
  14. Amfibius

    Amfibius Member

    Joined:
    Jan 8, 2002
    Messages:
    7,074
    Location:
    Melbourne, Victoria
    These are absolutely stunning. Thanks for sharing!
     
  15. OP
    OP
    tornado33

    tornado33 Member

    Joined:
    Mar 31, 2003
    Messages:
    6,989
    Location:
    Newcastle
    Thanks :)
    they are full screen pics, not cropped, just downsized for display. If I took a pic of the full moon it would just fit inside the pic. Field of view is roughly 1.5 degrees I think.
     
  16. WRC

    WRC Member

    Joined:
    Mar 18, 2004
    Messages:
    4,691
    Location:
    Perth, WA
    Bloody amazing bud!
     
  17. Grotburger

    Grotburger Member

    Joined:
    Feb 4, 2004
    Messages:
    319
    Location:
    Canberra, ACT
    Me wants one... :weirdo:
     
  18. Tyrael

    Tyrael Member

    Joined:
    Jun 27, 2001
    Messages:
    475
    Location:
    Cairns, QLD
    I think we all do, but then I'd have to add "astrology" to my long list of wanna-have expertees. There's just not enough hours in the day/night :(
     
  19. banshee

    banshee Member

    Joined:
    Sep 8, 2001
    Messages:
    1,759
    Location:
    Springwood, West of Hell (Sydney, actually)
    Ah, you do mean Astronomy don't you? I've never heard of nebulas affecting peoples lives... :p

    Great shot! Now all I need are a DSLR & a 'scope and... :rolleyes:
     
  20. avandonk

    avandonk Member

    Joined:
    Jul 19, 2003
    Messages:
    393
    Location:
    Melbourne the local universe
    Yes I agree all very good images especially since they are hand guided.How do you get away with 15min at ISO 1600 exposures without introducing noise?
     

Share This Page

Advertisement: