[ATM] The 16 inch Ultrathin ronchi pics

[vorblesnak@peak.org]

I got the mirror back today and had a half day of vacation left so I
stayed home and twiddled a bit.  I built a video ronchi device with a 1/4
x 20 TPI adjustment.  The final video was about 64 meg, or 6000+ images in
AVI, so I pulled some shots for discussion.

These first one is near the ROC, that was my index point.  Then I moved
one rotation or 1 20th of an inch and paused.

http://www.atmlist.net/contrib/vorblesnak-at-peak-dot-org/Ronchi%20Pictures/ronc001%20ROC2.jpg

This one seems to show that there is a hump in the middle ..

http://www.atmlist.net/contrib/vorblesnak-at-peak-dot-org/Ronchi%20Pictures/ronc007%20Hump.jpg

This is just inside the ROC one or two 20ths ..

http://www.atmlist.net/contrib/vorblesnak-at-peak-dot-org/Ronchi%20Pictures/ronc008%20one%2020th.jpg

In you look closly this one seems to show a bit of twist in the line ..

http://www.atmlist.net/contrib/vorblesnak-at-peak-dot-org/Ronchi%20Pictures/ronc012%20Astig.jpg

This is a stacked shot and if you look you can see that the center line
shits a bit between the two images.  Look at where it exits the edge of
the mirror ..

http://www.atmlist.net/contrib/vorblesnak-at-peak-dot-org/Ronchi%20Pictures/ronchi%20compare.jpg

Finally a line of four posing the question, what is in the middle?  I say
a hump ..

http://www.atmlist.net/contrib/vorblesnak-at-peak-dot-org/Ronchi%20Pictures/What%20is%20in%20the%20middle.jpg

The mirror did not ship well and the coating has gotten somewhat damaged. 
There are little abrasions here and there all over it.  BUT!  There is
plenty enough left to snag some moon shots when the new moon come out.  I
will also try for a nebula or two.

Finally, if anyone wants to see the entire ronchi movie let me know and i
will put it on a CD and mail it to you.

David Davis
Toledo, OR 97391

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