Like a Raining Stars

When photographing stars, you can either get a star "field," a static snapshot of the stars as points of light, or star "trails," where the stars' movements streak across the sky. How long you expose the image determines which you get.

The first rule of thumb to remember is that the Earth rotates such that the light from a star begins to "move" after about 30-40 seconds. (It's apparent movement is largely dependent on your lens—the longer the focal length, the more apparent the movement; the wider angle lenses won't show much movement till later because of the star point is so small.)

Part of your experimentation will be to gauge the timing for how much "trail" you want.

Information : http://www.danheller.com/star-trails.html

Hey it been a very very busy month lately, week after week just relaxed in my new apartment and watch cable TV, drunk lot of beers and Sake with my wife after weeks of hard day at work.

It been raining everyday since 1st of May, well it cool Bangkok down a bit and make it more fun to go to work when it rain in the morning on Monday first day of the week. somehow it helps us (Bangkokian) to stop using air conditioner, at lease for a while. ummm before i see you again, take care.

Photo : http://www.ifa.hawaii.edu/~joshw/astrophotography.html