From: John Murray 
To: Amateur Telescope Makers , Mirror Matic
        
Reply-To: John Murray 


Morning All,
        I've done another 3 x 5 minute sessions of figuring on the machine. The
pics can be accessed via the bottom link in my signature. After this last
session of figuring, I have taken 3 sets of knife edge readings (more to
develop the practice using this test). They are copied below as well. I'm
using front Six and FigureXP to help analyse the data. I'm a bit surprised
by the variability in the readings even allowing for my inexperience in
this test.The zones were calculated using Nils Olof Carlins method. Zone
#01 was nulled and then the ROC was measured from the centre of the blank
to the knife edge.

Blank Diameter=200mm
Optical Diameter=197mm
Secondary OD=46.000
Number of Zones=4
Zone # 01 Rcenter=39.300
Zone # 02 Rcenter=62.663
Zone # 03 Rcenter=78.967
Zone # 04 Rcenter=92.392
Moving Source Tester ala Stellafane Knife edge entering from left outside
ROC Radius of Curvature=2005.000
                1st     2nd     3rd
Zone 01 0.00    0.00    0.00
Zone 02 0.55    0.53    0.20
Zone 03 0.83    1.47    1.04
Zone 04 1.12    2.08    1.40

As usual any comments welcome.............

Cheers

John Murray
Whyalla
South Australia
Check our web page at http://astronomy.sa86net.com ATM and M-O-M stuff.
Latest Ronchigrams only at http://www.users.bigpond.com/imasloth/

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