[gregbradley]

I would be interested in that Peter. There are really only 2 AO systems on the market SBIG and SX. I was always somewhat suspicious of the SX unit seeing as the company is more of a middle ground type product maker, but willing to have it be otherwise.

I have often noticed Leo from Italy's images are very sharp with tiny stars and he uses an SX AO unit but on a GSO RC with relatively long focal length.

The SBIG units have many great examples of tight images.

By the way the term is Isoplanetic (also spelt Isoplanatic) Patch: which means the angular section of atmosphere where electromagnetic waves are parallel.

I think Ray referred to it as Isokinetic Patch which is another term for the same thing.
Greg.