Back to Home

ATM 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 | Amateur Telescope Making | Post

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

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by John Smith on October 29, 2002 01:51:25 UTC


I was aware that focal length was half of R.O.C. I wasn't sure if the way I was going about finding the R.O.C was going to be accurate enough for my purposes. I was trying to hold the filament of the flashlight bulb on the same plane as the board I was focusing the reflection on. I moved the board until the reflection of the light was it's smallest, any closer to the mirror or any further from the mirror, the reflection got larger.

I was asking about how to measure the focuser for finding out where to cut the hole in the tube because I have a 2" 52mm eyepiece, a 2" zoom eyepiece and some 1 1/2 inch eyepieces. I'm wanting to make sure that I will be able to bring all of them to focus.

Follow Ups:

Login to Post
Additional Information
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2024 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