star trail info

Discussion in 'Beyond the Basics' started by maverickphoto, Aug 10, 2008.

  1. maverickphoto

    maverickphoto TPF Noob!

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    I have a rebel xsi and i would like to take some pics of star trails, How do i go about doing this?

    jason
     
  2. rom4n301

    rom4n301 TPF Noob!

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    8 min exposure...
     
  3. doenoe

    doenoe TPF Noob!

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    well, you will need a tripod and a long exposure. I always try to get the ISO as low as possible, cause longexposures can get noisy.
     
  4. John_Olexa

    John_Olexa No longer a newbie, moving up!

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  5. Bifurcator

    Bifurcator TPF Noob!

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    Yeah, only 8min. is more of a "star-smudge" and not really enough for trails unless you take 15 to 30 exposures or something.
     
  6. Tha Bizness

    Tha Bizness TPF Noob!

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    Depending on your location (if you have light pollution) you would probably want to combine many short exposures to make your image. If you were to keep the shutter open for 8 minutes and you live in a light polluted area like most the resulting image will be over exposed and washed out.

    You do need a tripod or mount for a telescope and some sort of cable release.

    Here is a link from my flickr.com page. The image is made from 94 frames of 60 seconds each for a combined 94 minutes of star trails.
     
  7. rom4n301

    rom4n301 TPF Noob!

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    when i tried doin star trails i was on a beach so no light pollution.. and i did it for 8 min and it came out fine
     
  8. Bifurcator

    Bifurcator TPF Noob!

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    The Earth was rotating extra fast that evening? :D
     
  9. Garbz

    Garbz No longer a newbie, moving up!

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    Sweet. Finally good to see someone who uses this technique as well. http://farm2.static.flickr.com/1353/773160897_fae20200db_b.jpg here is one less then 5km from the city centre. The light pollution is representative of a 1 minute exposure. 120 exposures make up 2 hours worth of star trails.

    http://www.tawbaware.com/imgstack.htm Stacking is a good idea even if you do not want to take a maximum light reading since you will end up with less noise thanks to the sensor being reset at the end of every exposure.

    Good now try for 2 hours and see if there's some light pollution ;)

    Just a quick warning. A LONG exposures as in more than 30 min worth has been known to damage some cameras. The dead camera I saw was a Canon 350D, but also my Nikon D200 got too hot to comfortably hold after taking a 2 hour exposure.
     
  10. dhilberg

    dhilberg TPF Noob!

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    Sorry to resurrect this thread from the grave, but I have a question regarding this technique.

    Garbz, since Image Stacker doesn't process RAW files, did you shoot your images in RAW and convert each to JPG before stacking, or just shoot in JPG?

    Also, what would be a good white balance setting to use? Daylight?

    Since it's new moon I'd like to try this.
     
  11. CygnusStudios

    CygnusStudios TPF Noob!

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  12. Josh66

    Josh66 Been spending a lot of time on here!

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    I would use Daylight. It should look 'right' too.
    If you use auto, there's a good chance that every shot will be slightly different. Daylight will be consistant.
     

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