From: Guy Brandenburg 
To: David Holsclaw ,  atm{at}shore.net
Reply-To: Guy Brandenburg 


David,

I don't recall what your f/ number is, and I don't know how far you are
from the radius of curvature, but if it's f/8, and you are about, say 1/2
inch from the ROC, then it looks like you are done, and your lines look
very, very nice and smooth. From your final images, I for one do not see
any raised center, nor any TDE. Congratulations on what appears to be a
very nicely done mirror. Don't do another thing to it besides testing it
with a knife-edge to be sure it's corrected sufficiently. But, as I said,
it looks done to me. Very nice job!

Download and check out the ronchigrams from RonWin, at
http://members.aol.com/RonWin20/
if you haven't already done so.

Guy Brandenburg


David Holsclaw wrote:
>
> I think another hour of w-stroke (exclusively TOT) helped reduce the TDE
> on my mirror. See picture from test 4 at:
>
> http://homepage.mac.com/holsclaw/primary/Ronchi.html
>
> However, the lines have developed a slight bow toward the outside of the
> mirror (inside ROC). I think this means a slightly raised center? Also,
> I'm a little afraid that the bowed lines are just masking the TDE and
> that it has not really changed.
>
> If the center is raised then it would seem that going for parabola would
> just take a little longer but would fix the problem. Do I need to fix
> the raised center to get a good judgment of the TDE? As always, I'm
> looking for suggestions.
>
> Thanks again for all of your help!
> ---
> David Holsclaw
> Saint Louis, Missouri
>
>
>

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