(son of) Bristlecone Pine Star Circle
I'm proud! The Royal Observatory in Greenwich, England had this photo listed as "Our Latest Favourites" for quite a while. It's one of my favorites, too! In fact if I were forced to pick a favorite this is probably the top of the list because it was the first and in some ways most successful of my star trail shoots.
If you're wondering what you're looking at... it is 19 8-minute exposures - a total of 2 hours and 32 minutes worth of total time. The streaks in the sky are stars.
This is a reprocessing of the same image stack used for the "Bristlecone Pine Star Circle" (which see as lots of image details are there). This was created from 19 images each an 8 minute exposure totaling 2 hours, 32 minutes.
What is different? I was preparing to give a short lecture on how I do star trails, so I walked through the steps again with the following changes:
1. I first increased the raw exposures of all 19 images by 1 f-stop in Digital Photo Professional and bumped up the saturation (increasing the exposure always reduces the color saturation).
2. I then exported all 19 images and used Startrails.exe to stack them, but this time I started by averaging all 19 images before doing the stacking operation.
3. I applied a "digital" gray gradiant to the sky to bring it down in brightness a bit using Picsasa3 (it's called a "Graduated Tint" in the Effects tab).
4. I added a new copyright.
While this image has about 3 or four hot pixels, it appears that the averaging operation cleaned the image up quite a lot.
The shots were taken from 10:53 pm until 1:18 am on October 7/8, 2008. As I noted, for further details see the original image.
To see this larger click here.
My thanks to Kip Evans for making this available - and to you for your interest!
© Copyright 2009, Steven Christenson
All rights of print, exhibition, transfer, use, publication are reserved.