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
Foucault Tester With Bad Eye Relief!

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by on June 11, 2000 15:53:04 UTC

Hello all,

I`ve ran into a problem many years ago with the long focus solar
scope I made. The 4.25" f-15 mirror was so small, because it was so far
away it was hard to see the incredible subtle shadowings that were going
on there. I remember using a modified finder to get a "Closer" view.

Now I have the opposite problem here. And I`m wondering if there is
a simple way around it. I`m going to be shortly working on an old
project that I hopefully have found a design for, but testing the mirror
is very hard to do. It is that 15" f-1.1,, the light cone is so fat that
when using a foucault tester or even ronchi rulings to be able to see
the whole mirror fully illuminated your eye nearly has to touch the KE
or rulings. It`s like almost putting on contacts! Your eye begins to
water cuz it knows there is something so close it is about to poke it he
he he.

So is there anyway to get i guess you could call it "Better Eye


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 1994-2022 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