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Re: [ATM] Which stroke ?
Thank you Bob and Jim for your help.
Even if the figure could be good enough for a telescope I would really like to
improve the figure. It's my fourth mirror and I can take my time to finish
it. For the previous ones I wanted to finish them as soon as possible to be
able to observe. This time I decided to make this mirror in order to learn
more about figuring and not just to make a working telescope. I will make one
of course, but I'm not in a hurry.
So I'm going to try what Bob suggests (short strokes to remove the hole). But
I'd like a clarification about the edge. Jim says there is some TUE and Bob
says there's some TDE. Does this depend on the way to interpret the other
parts of the mirror ?
In other words saying "central hole, with TDE assuming the intermediate zones
are correct" is equivalent to "center is correct, a hill in zones
2 and 3 and a TUE" ?
Thanks again for your help.
Eric
Le Mardi 4 Mai 2004 01:36, Jim Burrows a écrit :
> At 2004-05-03 20:39 +0200, Eric Royer wrote:
> >The output from TEX is below.
> >In my opinion I have a high zone that lies in the second and third zones.
> > Is this correct ? How to correct that ?
>
> Sixtests agrees with TEX - high zone where you say + TUE, surface PV = 50
> nm, slightly undercorrected with b = -.970. But the surface RMS is only
> 10.8 nm, giving a Strehl of .941 - if the polish is good after 15 years
> lying about, I'd say good enough - go for a star test second opinion.
>
> -- Jim Burrows
> -- mailto://burrjaw@earthlink.net
> -- http://home.earthlink.net/~burrjaw
> -- Seattle N47.4723 W122.3662 (WGS84)
>
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> ATM mailing list http://www.atmlist.net/
--
Eric Royer,
http://www.astrosurf.com/eroyer/
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