[ATM] ronchi shots

[atmpob at yahoo.com (Dale Eason)]

We must know if the grating is inside COC or outside
COC.  If it is inside then you have a turned up edge. 
If it is outside then you have a turned down edge.

The problem you are haveing with the Foucualt is that
you must move the knife forward and back from the
mirror.  If the shadow is on the same side of the
mirror as the knife then you are inside the COC.  If
it is on the other side you are outside of the COC. 
For a sphere the whole mirror will dim at the same
time when you have the knife is exactly at the COC.

Do a search on the net for Foucault testing.  There
are many pages that should help explain it.

Dale Eason

--- c f <quantemlp@hotmail.com> wrote:
> Hello to all,
> 
> Well, I have gone back and polished some more, (now
> total about 6 hours on 
> my 6" f/7.4) and finally figured out how to take
> some shots of my ronchi 
> tests.
>            (
> http://www.geocities.com/quantemlp/page4.html )
> I would enjoy hearing back on what the members think
> of where the mirror is. 
> Other than in my living room in a container, I am
> not to sure how it is 
> comming along lol lol  Please send me some feed back
> and let me know what 
> you think.  I tried to do a foucault test, but I am
> still figuring out just 
> how to do that.  I get the mirror lit totally, and
> then tilt my rig and I 
> can cut the mirror in half making one side dark and
> the other lit, but I 
> dont see any holes or curves or really anything. 
> The Ronchi rule was 
> printed on my work computer, (has had the snot
> kicked out of it), on 
> transparencies that I know are not totally clear. So
> the quality of my rule 
> I question greatly.   I may either break down and
> buy a rule, or make one 
> with the fishing line.  but that is a project for
> tomorrow.  I found that I 
> lucked out on the room in which I do my testings in.
>  It is an inside room 
> (no wall is an outside wall, no windows).  so I
> closed both doors,  no 
> drafts, no thermals, heating ducts closed to that
> room.  perfect for 
> testing! that is a plus.
> 
> 
> thanks to all and clear skys
> 
> Charles in wilmington.
> 
>
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