Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: MarkS on Dec 21, 2014, 09:47:06

Title: Star Trails Friday 19 Dec
Post by: MarkS on Dec 21, 2014, 09:47:06
I took this on Friday night.  Canon 600D with lens set at 18mm.  One hour of data in 30 two minute exposures with just a single aircraft trail  :)

(http://www.markshelley.co.uk/Astronomy/2014/startrails20141219small.jpg)

Larger version here:  http://www.markshelley.co.uk/Astronomy/2014/startrails20141219.jpg

You can see stars from the south reflected in the windows.  The trees are blurry because of the breeze.

Mark
Title: Re: Star Trails Friday 19 Dec
Post by: Fay on Dec 21, 2014, 15:53:54
Really a good trail Mark!!!!!!
Title: Re: Star Trails Friday 19 Dec
Post by: Mike on Dec 21, 2014, 15:55:48
Really nice. I love all the different star colours.
Title: Re: Star Trails Friday 19 Dec
Post by: Fay on Dec 21, 2014, 15:59:25
so was it on the mount?
Title: Re: Star Trails Friday 19 Dec
Post by: Mike on Dec 21, 2014, 16:05:46
The weird reflections in the windows are great too.
Title: Re: Star Trails Friday 19 Dec
Post by: JohnP on Dec 21, 2014, 16:13:55
Yep agree full size is great, love star colours and windows reflections are cool as well...
Title: Re: Star Trails Friday 19 Dec
Post by: Kenny on Dec 21, 2014, 16:26:55
Awesome!
Title: Re: Star Trails Friday 19 Dec
Post by: Carole on Dec 21, 2014, 17:15:41
Looks great Mark.

Carole
Title: Re: Star Trails Friday 19 Dec
Post by: MarkS on Dec 21, 2014, 17:49:43
Quote from: Fay
so was it on the mount?

No - on a static tripod.

Quote from: Mike
The weird reflections in the windows are great too.

I'm trying to get my head around the fact that star paths actually cross over in the reflections.  How does that work?

Mark
Title: Re: Star Trails Friday 19 Dec
Post by: JohnP on Dec 21, 2014, 18:10:27
Yes weird the way they look sinusoidal....
Title: Re: Star Trails Friday 19 Dec
Post by: Fay on Dec 21, 2014, 18:21:47
never heard of that word John
Title: Re: Star Trails Friday 19 Dec
Post by: MarkS on Dec 21, 2014, 18:37:59
Quote from: JohnP
Yes weird the way they look sinusoidal....

I know the glass is not flat - they are double glazed sealed units and are concave.  So that will have something to do with it ...
Title: Re: Star Trails Friday 19 Dec
Post by: The Thing on Dec 23, 2014, 14:39:41
Really nice Mark. Did you use StarTrails to put the subs together?

Wiggles - the double glazing must be flatter glass on the RHS window then as those reflections are almost 'correct'!
Title: Re: Star Trails Friday 19 Dec
Post by: MarkS on Dec 23, 2014, 22:02:22
Quote from: The Thing
Really nice Mark. Did you use StarTrails to put the subs together?

No - Startrails and StarStaX both produce 8 bit images but I wanted to keep it 16 bit to perform final tweaking to get good star colour.  So I used Iris of course!  Addmax2 is the command.

Photoshop would also do it if you blend them in "lighten" mode.

Mark