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03/24/2010 11:26:36 AM · #1 |
So I got some cool night shots, now I dont know what to do with them.
I know you can stack them so you get a cool star trail , but I dont know how to do it.
Anyone have any suggestions on how to do this?? |
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03/24/2010 11:29:02 AM · #2 |
| I thought there was a tutorial on this subject somewhere around here, If not on DPC, google it because I know i have read one someplace. |
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03/24/2010 11:31:48 AM · #3 |
| The program RegiStax is designed for stacking astronomical images, but I think it's usually used to reduce noise and eliminate star trails. |
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03/24/2010 11:35:43 AM · #4 |
| I thought there was one on here too, but can not see it. |
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03/24/2010 11:42:32 AM · #5 |
//theamusing.com/photography/startrails.html/
There is a video down in the references section... I didn't watch it all but it does say it will show you how to stack in photoshop. |
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03/24/2010 11:59:16 AM · #6 |
Try here: //www.dpchallenge.com/forum.php?action=read&FORUM_THREAD_ID=883677&page=1#5392818
It seems  kirbic knows something about it
Message edited by author 2010-03-24 11:59:37. |
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03/24/2010 12:07:01 PM · #7 |
hmmmmmmmmmmmmmmmmmpfffffffff well I stacked through PS in the files -scripts. then lightened each layer and ended up with this.
not really what i was expecting though. also shot at ISO 100
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03/24/2010 01:57:25 PM · #8 |
Hi Juliet!
I used www.startrails.de, it only works for pc, to get this:  .
Bear in mind that they are 200x 30 seconds exposures, I don't know how many did you stack.
But it's just so easy to use, just input the images and you're done!
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03/24/2010 04:10:52 PM · #9 |
| The technique used to composite fireworks, as described in this Tutorial, might work for what you need, if you have a sequence of images you can line up. |
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03/25/2010 01:44:35 AM · #10 |
| stack them and use 'lighten' blending mode. |
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03/25/2010 02:12:01 AM · #11 |
I posted a thread here about a week or so ago about this stuff :)
I've learned a little more since then, and I'll share what I know.
I should say also, that I'm doing real long exposures, not stacking.
So here's what I know:
Stick with apertures between 3 and 6 (Depending on how close your nearest foreground object is)
It's easiest to focus on the moon
Use LENR (Long Exposure Noise Reduction) as it's very, very important, but keep in mind this DOUBLES the time the camera takes to make an exposure, essentially take a photo and then wait an equivalent amount of time for a dark exposure of the same duration..
This eats batteries like I eat Prima Donna cheese
ISO 200-400 seems to work best (100 leaves the sky too bright and the stars too dim, while anything above 400 is WAY too noisy on a 50D, even with LENR)
A heavy tripod is a good thing
Airplanes suck
A thermos of coffee or hot chocolate is a very good friend to take along (oh, a real friend is a good idea too as you'll spend a bunch of time waiting.)
Enjoy.. Oh here are some of my first shots (I'll post more soon, weather is not being cooperative this week)
This is the last shot from the evening, clouds had started to soften everything in the sky
One of the first shots of the evening, should have used a smaller aperture, and the wind gusted a bit after the exposure started so that didn't help one bit either..
The best shot I've gotten thus far.
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03/25/2010 02:50:49 AM · #12 |
//www.startrails.de/html/software.html
Will help, and it also lets you use darks so you dont need to do long exposure noise reduction. Simply shoot a shot once your camera is all warmed up with the lens cap on of the same ISO, and length as you're shooting the sky. This will give the software your camera's noise info.
//deepskystacker.free.fr/ is also a lot of fun, letting you get see more of what's in the sky by stacking frames not intended for star trails. This lets you use dark, flat, dark flat and bias frames to get some really impressive images even at higher ISOs. With the D700 i can safely shoot 3200ISO with almost no noise at the end.
I'll be spending 3 nights shooting the sky over Easter, really looking forward to it! |
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