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 Post subject: More star trails
PostPosted: Wed Jan 07, 2009 12:17 am 
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A fairly clear night, so I had another go too. Light pollution was worse than before. I don't think there is more light, just more stuff in the air to show it up.

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Sony a350 + CZ16-80 at 16mm, f/4, ISO200

Exposure was taken in 239 shots continuously of 30s each and recombined with dark frame subtraction. I notice end to end duration was 2h9m which doesn't add up. I can only assume there were short gaps between each shot which adds up to the extended length. That works out about an average 2 seconds between each shot.

The main block of lines in the middle is Orion. The bright white line near the bottom is Sirius.

And click here for a video of the same. Frames shown at 10fps. That's effectively about 325x actual speed factoring in the gaps previously. Hmm... looking at it myself it didn't resize well here. I'll find and upload elsewhere at higher quality another time as I should be in bed by now.

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PostPosted: Thu Jan 08, 2009 2:47 am 
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I would say this is one of the best star trail shots I have ever seen! Great capture! 239 shot must have been a pain to go back and edit...

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PostPosted: Thu Jan 08, 2009 5:59 am 
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I like it - I particularly like how you've got curvature in both directions so to speak...


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PostPosted: Thu Jan 08, 2009 7:54 am 
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Thanks. Editing wasn't bad as the software automates the combination and dark frame subtraction. So all I had to do was any PP which I chose not to in this case.

Forgot to mention before, but there were ice crystals forming on the lens hood and tripod at the end. I put the hood on in case the moon would give rise to flare. On that note, anyone done a trail shot with the moon in before? Wonder how that might turn out...

I'd really like to try this at even wider angle but such a lens is still some way off.

For a change I think next time I'll have to try facing north. But my front garden isn't secure so I'll have to find other ways if I'm going to leave it unattended...

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PostPosted: Thu Jan 08, 2009 8:15 pm 
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I think the moon would burn out the shot under normal star trail conditions, BUT you might have some success at a small aperture or with an ND filter - maybe get a big stripe across the sky with an illuminated foreground?


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PostPosted: Thu Jan 08, 2009 8:58 pm 
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One way to find out. Next time there's a clear sky I'll try it.

Certainly given the moon's brightness it'll be hard to keep that and anything else... but I think it'll be ok to burn the moon out since the trail means no useful surface detail anyway. I just don't know how much "glow" there will be around it. The other one I've seen done is the time lapse stack so you get several moons... wonder if there's a way to do a bit of both?

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PostPosted: Fri Jan 09, 2009 10:24 pm 
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Here is the moon trail!

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Sony a350 + CS16-80 at 16mm, 20s, f/13, ISO100

488 files combined with 2 dark frames. I basically set it up when I got home from work, and let it until the battery went dead about 3 hours later. There is quite a bit at the end where the moon was out of shot.

As can be seen there is a thin cloud so no chance for stars tonight, and the moon varies in brightness with the cloud.

Currently having a fight with codecs but will do a video of this shortly.

Edit: if this works, video is now here. Wish there was a bit more cloud for something to be happening all the time.

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PostPosted: Sat Jan 10, 2009 3:49 pm 
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Love the star trail shot and as Gordon said it looks like the stars are diverging!

The moon trail shot is an interesting theory, I havent considered this before. I have done something similar with a lunar eclipse but that was to montage in a single shot showing the various stages.

Keep em coming.

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 Post subject:
PostPosted: Sat Jan 10, 2009 4:17 pm 
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The moon rise was more interesting in the video than the trail. I still hope to get stars with it another time as I want to see them move at different rates.

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 Post subject:
PostPosted: Sat Jan 10, 2009 5:22 pm 
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See I was wondering if you could set up two cameras side by side and set one for the moon and one for stars. The problem is that the moon is so luminous it will obscure the stars, unless it was done with a crescent moon maybe?

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 Post subject:
PostPosted: Sat Jan 10, 2009 5:26 pm 
Wow.. that moontrail is sooo cool. Very well done.
I'd love to try that out one day.


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 Post subject:
PostPosted: Sat Jan 10, 2009 8:21 pm 
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Very cool moontrail! I don't think I've seen a photo like this before...


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 Post subject:
PostPosted: Fri Jan 16, 2009 12:19 am 
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I just uploaded the video created from the same data as the 1st trail shot. It can be found here where you can see Orion move across the sky. Download version shows many more stars than the streamed version.

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 Post subject:
PostPosted: Sun Jan 18, 2009 10:55 pm 
@Popo - Very nice effort. I like both, pics and time lapse videos created from those.


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 Post subject:
PostPosted: Sat Jun 06, 2009 1:25 am 
Sorry for reviving an old thread but what are the dotted lines in the first picture? Those are obviously going much faster than the stars...


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