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Old 20-08-2012, 13:13   #1 (permalink)
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Introduction to photographing the night sky.

Ok folks so here I am going to attempt to pass on some of my knowledge about taking photographs of the night sky.

For those of us who are lucky enough to not live in a major city (exclude me) the night sky is an amazing sight when you look up. Those of us who do live in a city will see only a fraction of what is actually up there due to the light pollution.
With this in mind the first thing you are going to want to do when imaging the night sky is to get out of the city. It isnít practical in England to have truly dark skies but you can give yourself a fighting chance.
In this section I am going to deal with simple straight forward night sky shooting and leave the stacking for another chapter.
Now you are hopefully away from the worst of the light pollution you can sit your camera on its tripod and pour yourself a nice hot chocolate. Give your eyes 5-10 minutes to adjust to the darkness and then if you look south and up if youíre lucky you will see the milky way in all its majesty. Really you can see it with the naked eye and it is amazing. Now to capture this in a photograph we are going to have to take a few things into consideration. In general terms you will want to set your camera to ISO 1600 with an exposure of 25 to 30 seconds. Depending on what lens you are using and how much star trailing you are willing to accept will be a factor in the exposure time. As a general rule of thumb you divide 600 by the focal length of the lens not forgetting any adjustment for sensor size.

An example would be my 17-85mm lens set at 17mm on a Canon EOS 7D So 17x1.6 for sensor crop thingy gives us 27.2ish, 600 divided by 27.2ish gives us 22ish. So to avoid trailing stars I would have to use an exposure of 22ish seconds. Im using ish a lot because all of the setting are very ishy to be honest but it gives you a starting point. You will then want to open up the lens to itís widest aperture and the close it one stop.
Switch your lens to manual focus and focus it to the infinity mark, thatís the lazy #8, it looks like a number 8 laying down for those of you that donít know.
Now you will want to minimise any movement of the camera on the tripod whilst the exposure is taking place so if it is windy remove the neck strap and if you donít have a cable release use the timer setting to trip the shutter. If you really want to go belt and braces you could also use the mirror lock up.
After you have your shot make any adjustments you feel are needed to the settings and take another shot. Again make any adjustments to ISO exposure etc and take some more.



To add a little more interest maybe include some of the surrounding landscape however be aware that the more your camera is towards the horizon the more light pollution will creep into shot. This can sometimes be quite effective but most of the time itís a pain in the ass.
If your really lucky you may even get a meteorite etc fly across your shot whilst the shutter is open.

When you have your shots the next thing to do is to load them into your processing software. I use Lightroom and Photoshop and switch between them making adjustments.



The luminance control in lightroom is very very good for controlling the noise in the image and bringing out some of the colour whilst I find Photoshop great for doing several curves and levels adjustments.
Right so there you go, a basic starter for ten introduction to taking photographs of the night sky. I will try and put into some sort of English my method of stacking photographs in the next instalment.
Cheers Gary
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Old 20-08-2012, 13:19   #2 (permalink)
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Re: Introduction to photographing the night sky.

Very cool of you, thanky
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Old 20-08-2012, 13:43   #3 (permalink)
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Re: Introduction to photographing the night sky.

Super tutorial

Thanks Gary.
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Old 20-08-2012, 16:31   #4 (permalink)
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Re: Introduction to photographing the night sky.

Some very useful tips, thanks
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Old 20-08-2012, 17:32   #5 (permalink)
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Re: Introduction to photographing the night sky.

Very useful indeed.

I went to a really, really dark place and tried to get some milky way shots, unsuccessfully I might add, last year! Results are below but I am due back to that part of the world again soon so I might try again after reading a few of your tips.

Terrible photo below I know but you can get the gist.
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Old 20-08-2012, 17:45   #6 (permalink)
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Re: Introduction to photographing the night sky.

Thanks Gary - Look forward to the stacking one too
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Old 20-08-2012, 22:14   #7 (permalink)
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Re: Introduction to photographing the night sky.

A very useful tutorial, and one I will try and get some practice with. I just need to get out of London....
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Old 21-08-2012, 00:40   #8 (permalink)
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Re: Introduction to photographing the night sky.

Thanx alot gary
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Old 21-08-2012, 04:41   #9 (permalink)
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Re: Introduction to photographing the night sky.

thanks Garry ! very kind of you to pass on your knowledge ! I appreciate that !!
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Old 21-08-2012, 20:47   #10 (permalink)
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Re: Introduction to photographing the night sky.

Hmm this is good stuff I may give it a go
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Old 21-08-2012, 21:52   #11 (permalink)
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Re: Introduction to photographing the night sky.

Oh, something else for me to try out. Thanks for the info.
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