[ATM] Webcam Hartmann

[mauritz at physi.uni-heidelberg.de (Mauritz Andersson)]

Impressive work! I'm keen on trying it out at some point.
I wonder, what is the optimum position of the camera plane
with respect to (paraxial) focus, in terms of sensitivity?
I would expect that if one is too far away the difference
beween a spherical wavefront and the actual one is smaller,
in terms of the measured diffraction pattern. (And at some
point the pattern becomes too small to fit the camera...)
To close to focus would mess upp the individual points 
in the pattern, I guess. But what is the best setting? Or
I am missing something obvius?

Best regards,
Mauritz


On Wed, 2004-02-25 at 22:12, Jim Burrows wrote:
> 2+ years of struggle have finally produced a program which will produce 2D 
> mirror surface deviation contour plots from Hartmann-style images taken 
> using one of the many available PC cameras (maybe even one of those 
> expensive astro CCD cameras - anyone want to try?).