Thanks guys, but the reason for the post was to illustrate the performance of the AP130GTX....which is a rare bird by any measure.
Sure there are many unusual targets available, but a comparison is difficult with apples and oranges...hence my "standard candle" comment.
Also, as Greg and others have touched on, it's also a case of "careful what you wish for" with a 16803 chip. Fantastic acreage but also shows even the slightest lack of correction, be it optical or mechanical at the edges.
Many systems that take delightful images with an APSC chip do not fare so well 50mm off axis, and in fairness, were never designed to do so.
Fortunately there are many equipment choices available these days, so you don't have go 50mm off axis, yet still get a great result...I simply wanted to show what it looks like when you do.