From: "Vladimir Galogaza" 
To: "ATM shore" 
Reply-To: "Vladimir Galogaza" 



>One way I know of for eliminating rings is through apodization, but
>then this just increases the size of the central disk - you have just
>as much resolution as before - no more, no less.

I seriously doubt this " no more no less" statement.

Resolution problem due to diffraction on aperture boils down to the Airy
disk size. Increasing the central disk size equals loss of resolution,
fringes or not. This is so because of how resolution is defined.

Loss or increase of contrast is just another consequence of diffraction.
But keeping resolution and decreasing aperture is contradictio in adjecto.
In usual noncoherent case. Interferometric Aperture synthesis for
resolution increase is not what we are talking about on this thread.

Redefining definition of resolution is possible but then we are not talking
about the same thing.

--- BBBS/NT v4.00 MP