Basic Astrophotography Question

jermng · Post by **jermng** » Tue Sep 19, 2006 7:43 pm

jermng wrote:I think it doesn't matter because the "movement" of the stars across the film/CCD as seen through that focal length (magnification) will be minimum regardless of exposure ...

Playing with the Aperture or F/stop will just give you brighter/darker stars/sky and not affect the trail.

Hi Clifford,

It's more about avoiding star trails than it is about getting the "correct" exposure.

The exposure times given are just a guide for different lattitudes and areas in the sky for un-tracked astrophotography purely to avoid star trails.
Using that time, you can play with the ISO and f/ratio to experiment for the best exposure.

Hope this helps.

Clifford60 · Post by **Clifford60** » Tue Sep 19, 2006 8:55 pm

Got it, thank you guys. Regards

hansgalaxy · Post by **hansgalaxy** » Wed Sep 20, 2006 8:59 am

erm.. any good and free image stacker out there? RegiStax 3? Good ? Pls advise.. thanks :?:

Post by **weixing** » Wed Sep 20, 2006 9:03 am

Hi,

erm.. any good and free image stacker out there? RegiStax 3? Good ? Pls advise.. thanks

RegiStax is good on Planetary & Lunar image. Try IRIS ( http://www.astrosurf.com/buil/us/iris/iris.htm ) for deep sky and wide field image.

Have a nice day.

hansgalaxy · Post by **hansgalaxy** » Wed Sep 20, 2006 9:39 am

thanks!