Nice program Al,
(gee I dunno, give a bloke something for free and he still winges!
)
How hard would it be to run up a utility that would place a pair of diagonals across a sensor image. What you have produced is great for a square image, but it wouldn't allow a star/object alignment on center chip too well. A set of crosshairs that would go from corner to corner of a rectangular imager display, DSI, 350D etc. would really hit the spot for many people I should think.
Still great effort and thanks.
cheers,
Doug