From: "Rich Ball" 
To: "ATM" 
Reply-To: "Rich Ball" 


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I am figuring an 8" f6. =20

My current dilemma concerns zone 1.  When I started out my zone 5 was = off
the charts, .200", long.  I have brought that back and all the zones =
are much closer together, close to  goal  -- except for zone one.  Now = it
comes up way too short, .100" more or less, on the Foucault tester.  =
And it is hard to read even at that because it does not null-out in a =
typical manner.  I am using a Couder mask with the center blocked so = zone
one shows up on both sides rather than as one big hole in the mask. =
 But when I try to null out the zone the shadow enters both sides of the =
mask from the left rather than from the outer circumference in. =20

There is an obvious problem with the center of the mirror.  Have I given =
enough information that someone can tell me what I should do about it.  =
Is it too shallow?

I'll send more information, numbers, if someone wants them.

Problem # 2:
I put a scratch in my mirror on the last wet.  I know where it came from =
so I am clean to proceed.  Can such a thing be polished out?  It's about =
1' long in zone 3.

Thank you all.

--Rich Ball
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I am figuring an 8"
f6.  
 
My current dilemma concerns zone
1.  =
When I=20
started out my zone 5 was off the charts,
.200", long.  I have = brought=20
that back and all the zones are much closer together, close to  =
goal =20
-- except for zone one.  Now it comes up way too short, .100" more =
or=20
less, on the Foucault tester.  And it is hard to read
even at = that=20
because it does not null-out in a typical manner.  I am using a =
Couder mask=20
with the center blocked so zone one shows up on both sides rather than = as one=20
big hole in the mask.  But when I try to null out the =
zone the=20
shadow enters both sides of the mask from the left rather than from = the=20
outer circumference in.  
 
There is an obvious problem with the center =
of the=20
mirror.  Have I given enough information that someone can tell me
= what I=20
should do about it.  Is it too shallow?
 
I'll send more information, numbers, if =
someone wants=20
them.
 
Problem # 2:
I put a scratch in my mirror on the last =
wet.  I=20
know where it came from so I am clean to proceed.  Can such a thing = be=20
polished out?  It's about 1' long in zone 3.
 
Thank you all.
 
--Rich
Ball

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