optics-sept-7
A montage of a full range (10mm) focus sweep- focus 0 is at bottom left, focus 9500 is at top right.
Each image along a row has a focus +500 from the one before it.
To be concrete, the images in the left most column have, starting from the bottom, foci of 0, 2000, 4000, 6000, 8000 microns.
DES r-band 1576-1596, Object at CCD1 (same as last night, we just swapped the numbers in the fits file) row,col=2470,465.
The donuts are cleaner, more symmetrical, but the still distorted (at high focus) at lower right, huge astigmatism remains, and
of course, the central donuts. It is improved, but by a matter of degree.
A comparison with last nights DES r-band data, the new data on the right (the one with the cosmic ray).
The donut is, in fact, improved markedly. We aim at a circular, smooth in outline donut, and the
new one is better.
Hartmann trajectory, in frames 1604-1624 CCD1 (same as last night as number switched in fits file), row,col = 1615, 1755.
Following the idea that the points on the top plot that don't follow trajectories that cross a single point in the lower plot,
the first five bright spots starting from right to left are problematic; the bottom of the mirror.
Hartmann mask focus sweep, in frames 1604-1624 CCD1 (same as last night as number switched in fits file), row,col = 1615, 1755