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 HDR Astro Timelapse 
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Joined: Sun Feb 23, 2014 12:35 pm
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Post HDR Astro Timelapse
Hi all

I have been doing daylight timelapses for sometime as well as HDR timelapses.

However I would love to try night time HDR. Has anyone experimented or created anything or got any advice?

The main issue I am contemplating is the long exposures times and avoiding star trails.

For photographing stars and standard timelapses I use a 5Dmk2 + 24mm 1.4 lens and the '500' rule to work out the correct timings. Usually around 20.8 seconds on iso 3200.

However assuming I use the same technique as my day time HDR timelapses I would have to bracket and use 3 x exposures.

The question I want to ask is would I need to use stacking software or my normal hdr software to merge the images? I don't want any star-trails.

Cheers :-)


Sun Feb 23, 2014 12:55 pm
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Joined: Wed Apr 03, 2013 7:20 pm
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Location: Brisbane, Australia.
Post Re: HDR Astro Timelapse
My question is what do you expect to gain from attempting HDR of the night sky? Unless you are in or near a city it would be close to impossible to shoot an over exposed image of the night sky, and your under exposed image would just be black.

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Sun Feb 23, 2014 3:08 pm
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Joined: Sun Feb 23, 2014 12:35 pm
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Post Re: HDR Astro Timelapse
Hi thanks for the response. I am looking to play around with foreground lighting and also create more detail in sunrise / sunset lapses.

I guess my real question is id like to know the best way to get maximum detail on star-lapses.

For single images the stacking approach is awesome, but using that for a timelapse? I cant see it working. Hence I thought about the HDR idea. I could be barking up the wrong tree entirely, but the level of detail on star lapses on videos like the below can't be from a single exposure surely?

http://vimeo.com/29950141


Sun Feb 23, 2014 3:41 pm
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Joined: Wed Nov 25, 2009 1:17 am
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Location: Hindmarsh Valley, South Australia
Post Re: HDR Astro Timelapse
They can only be single exposure. You can get even more detail as well if you are in totally dark skies. Run a full frame camera at 3200 (or higher) and a f1.2 lens along with the right atmospheric conditions. You'd be surprised.

EDIT: just reread your post and the camera and lens details you are using are perfect for such astro work. You just need to right sky.

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Sun Feb 23, 2014 4:44 pm
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Joined: Sun Feb 23, 2014 12:35 pm
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Post Re: HDR Astro Timelapse
Much appreciated, i'm thinking I underestimated the power of really dark conditions. I'm hoping to take advantage of that next month in Iceland :-)


Mon Feb 24, 2014 11:48 am
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Location: Hindmarsh Valley, South Australia
Post Re: HDR Astro Timelapse
I reckon Iceland would have great skies for the job !

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Mon Feb 24, 2014 1:54 pm
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Location: Brisbane, Australia.
Post Re: HDR Astro Timelapse
bohemianweds wrote:
Much appreciated, i'm thinking I underestimated the power of really dark conditions. I'm hoping to take advantage of that next month in Iceland :-)


I was hoping for really dark conditions a few weeks ago when I was back in NZ but the weather didn't play along.

As an example, I tried a test shot outside my house one night (basically the middle of the inner suburbs) using the same ISO, aperture and exposure I'd use to shoot astro, and due to the light pollution the image was almost completely blown out and white. So yes, the darker, the better!

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Mon Feb 24, 2014 3:34 pm
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Joined: Thu Feb 24, 2011 5:37 pm
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Location: Córdoba, Argentina
Post Re: HDR Astro Timelapse
Shooting at ISO 3200 and f/2 on a REALLY dark sky location will give you amazing results and a lot of detail on the foreground. I was surprised about it a few weeks ago when I tested my new gear.

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Mon Feb 24, 2014 6:14 pm
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