ATM "matching ronchi" help!

[rodney daigle <rd1113@yahoo.com>]

Hi all,
 I’ve been an ATM list member for about 2years now and
really enjoy reading most of the input everyone has to
offer, I find it is a source of relaxation for me, not
to mention the extraordinary amount of knowledge that
can be gained regarding the building of amateur
telescopes and then some. Up until this point ive
never had the need to post, to search the archives has
been sufficient, but iam at a point in figuring my
first mirror a 6in f5.3 where I really could use some
assistance. Basically iam using Mels “Matching Ronchi
Program” as an aid to my figuring and I believe im
close to the target figure – of course I could be
totally wrong – because my experience with ronchi
interpretation is in its infancy and I need some help.
I think from around the 30% zone to the 80% needs to
be a tad deeper hopefully blending out the tde in the
process, im just not sure that is what I need to do or
how to go about doing it(stroke type), so please if
you would all be so kind as to take a look I would be
grateful for any guidance. I’ve posted my ronchi
images in the ”matching ronchi” style with the first
pic being -.3in. inside focus progressively moving
thru focus to eventually .7in outside focus in .2in
increments. 
The web address (unfortunately w/advertisement) is: 
http://www.geocities.com/rd1113/6in53.html?1003021799705
The matching ronchi program parameters are:
dia=5.890in, fl=31.5625in, line freq=100, parab=1 (1/4
wavefront error : parab can range from .42 to 1.58). I
really like the concept of the matching ronchi and I
find it an easy and intuitive program to use
particularly for a beginner like myself who honestly
wouldn’t accurately know zone 2 from zone whatever in
a Foucault image – their pretty but I don’t have the
time under my belt to judge the correct zone nulls.


Thanks for taking the time
Peacefully clear skies
Rodney Daigle


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