Back to Home

Astrophotography Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Astrophotography | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Field Rotation

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by Steve Henderson on October 5, 2000 17:22:10 UTC

Ok, so these are pretty basic.. At least we`re keeping the forum active... ;-)

Here`s one: I remember reading that the length of time exposure, even guided, for a Dobsonian mount is limited due to the inevitable field rotation that will occur. (The stars "move" in an arc, but the mount holds the eyepiece / camera in a fixed position - hence "field rotation" problem. Will get trails eventually no matter what you do..)

Does anyone know about how long that is? I realize there`s a difference at various elevations - but ballpark would be interesting to start considering. Thanks

Follow Ups:

Login to Post
Additional Information
Google
 
Web www.astronomy.net
DayNightLine
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2019 John Huggins All Rights Reserved
Forum posts are Copyright their authors as specified in the heading above the post.
"dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
are trademarks of John Huggins