Yes my Canon 300mm F2.8L is the non IS version.It does seem to perform better than than the 300mm F2.8L IS on Jerry Lodriguss site.Focus is absolutely critical.The symtom shown on Jerrys site leads me to believe the IS optical train is 'parking' slightly misaligned when the IS is turned off.
This is another example of one of the immutable rules of the Universe:-
You can't have everything at once or each time you improve one parameter another goes awry.
Or said another way,there is no free lunch in this Universe!
Here is a single jpg straight out of the camera.It has only been processed with Noiseware Professional (this reduces size without affecting anything else).
http://users.bigpond.net.au/avandonk...0_filtered.jpg
The colour is due to the Hutech Nebula Filter and the light pollution from high pressure Sodium street lamps which have emissions at green that get past the filter .Note that the stars are just as good whether centre or any edge or corner.I have yet to see the performance of this lens with a full frame.I suspect it would not be as good if you look at the MTF diagrams of this lens.One (left)is for the 300mm F2.8L the other the 400mm F2.8L.There is only one lens that has a better MTF diagram and that is the Canon 200mm F1.8L.
Bert