[Comm2011] More...

[helmich]

 Some more info about Tilt/PSF.  

 For the benefit of Koen's tilt code Andrea changed the Focus
template a little. A single normal science exposure it taken ahead of
the Focus sequence. This image is used to define the x,y starting
points to search in the sextractor catalogs for the stellar
sequences.  

 Koen believes he's managed to disentangle the effects of the
telescope (optics + tilt) and instrument tilt. This by taking 5 focus
sequences at 0, -90, 180, 90, 0 degrees rotator. Tonight he'll talk it
through with Pietro.   

 Ewout  
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