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May 2, 2010
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Iridium Flare 02-05-2010 by Chrissyo Iridium Flare 02-05-2010 by Chrissyo
Just a short star trails image of an Iridium flare. I didn't actually know it was going to occur, catching it on camera was a complete fluke - I had the camera set up just doing some time lapse stuff.

Taken with a Canon 400D. I was taking continuous 30 second exposures at ISO1600. I used the Startrails program to stack a dozen or so images together. I also edited the image slightly to remove the gaps in the Iridium trail that resulted from the short time between images.
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:icons-e-n-t-e-n-z-a:
S-e-n-t-e-n-z-a Featured By Owner Aug 22, 2010
Iridium Flare is perfect!!!Very good!!!
:)!!
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:iconquicksimon:
quicksimon Featured By Owner May 3, 2010
Nice capture mate! :)
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:iconwzrdofozfan:
wzrdofozfan Featured By Owner May 3, 2010
Beautiful and amazing.
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:iconeman333:
Eman333 Featured By Owner May 2, 2010  Professional Photographer
Oh, and whats an Iridium trail ?
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:iconchrissyo:
Chrissyo Featured By Owner May 2, 2010  Hobbyist Photographer
It's the line of light you can see in the image, the actual path traced by the satellite.
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:iconeman333:
Eman333 Featured By Owner May 2, 2010  Professional Photographer
I stumbled across your Youtube channel the other day. You have some impressive astrophotography! I tried doing some star trails for the first time last weekend. Nothing of this quality though...

How exactly does stacking work? I haven't been able to find much info on how to actually do it. And what program do you use for it?
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:iconchrissyo:
Chrissyo Featured By Owner May 2, 2010  Hobbyist Photographer
Thanks for the kind words! Keep at it, practise makes perfect. =)

For star trail images I use a small bit of freeware called 'Startrails' [link] . You just select the images you want to use in the star trail image and it automatically stacks them together.

Stacking is generally when you add the pixel values of images together. Like if the pixel value of row 1, column 1 in one image is 5 and the similarly positioned pixel in a second image is 7, adding them would have a pixel value of 12. And there are other ways to do it too, like averaging the values and other fancy things.

I'm not actually sure what type of stacking this particular program seems to use. You don't really have to know I guess, just throw the images in. If you want more control over how the program stacks the images you could use other programs like 'Iris'. I think Photoshop lets you do a few different similar things as well.
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:iconeman333:
Eman333 Featured By Owner May 2, 2010  Professional Photographer
Thanks for the info. What does each individual photo in the stack look like? and what shutter speed/aperture/iso settings do you recommend for each photo?
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:iconchrissyo:
Chrissyo Featured By Owner May 3, 2010  Hobbyist Photographer
[link]

Thats a 50% resized individual image. It's the one just as the satellite was flaring.
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:iconchrissyo:
Chrissyo Featured By Owner May 3, 2010  Hobbyist Photographer
I'll upload one of the individual photos to my scraps and link it to you in a short while. I use 30 second exposures at ISO1600 with the aperture as far open as it will go (I'm not actually sure what setting/value this is on my camera). Basically, I just set it such that I get the most light possible. There are some conditions where you might want shorter exposures/lower ISOs though, like if the Moon is about or something. I spose you'd just want to try some different settings in different conditions to see how it works with your camera.
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