Thread: streaky photo
View Single Post
  #1 (permalink)  
Old 23-October-2007, 07:52 PM
tdvance's Avatar
tdvance tdvance is offline
Order of Kilopi
 
Join Date: Apr 2006
Location: Bowie, MD
Posts: 3,651
Default streaky photo

or star trails, on purpose for once:

http://www.howardastro.org/gallery/t..._trails?full=1

in the area of Algol and Aries--about an hour, 55 30-second exposures combined. I screwed up and set the camera to ISO 1600 when I wanted ISO 100, but it was at F/13, 100mm telephoto lens. The field of view is about 10x15 degrees. I combined them with MLUnsold's ImagePlus, then cut the remaining skyglow out with photoshop (as well as "tripling" the image to fill in the gaps in the trails--camera took 35 seconds between each 30-second exposure). Still, some stars look beady--partly from processing (Especially the "triple" beads) and partly it was a lower-frequency component of the twinkling of the stars.

A second mistake--I planned to get Pleiades in it, but just set up the tripod and forgot to actually look through the viewfinder, so I was up and left a little too far. It took 15 minutes of comparing the FOV with Starry Night to figure out what I actually took a picture of.

Todd
__________________
-----
Todd (Bowie, MD, US, North America, Earth, Sol System, Vega region, Local Bubble, Orion arm, Milky Way Galaxy, Local Group, Virgo A Cluster, Virgo supercluster, the universe in which spock is clean shaven)

Quidquid latine dictum sit, altum sonatur.

personal page: http://blog.astrosketches.info
Reply With Quote