That limited refutation seems reasonable, of otherwise pretty decent information.
Originally Posted by Nicholas Lindan
I don't want to open a can of worms but I believe there could be an error of focus with respect to ultraviolet vs visible in my system... which is quite different than the norm (though not an unreasonable system). I use graded paper and an Aristo grid bulb through a Xenar lens... I may have a system that is more susceptible to focus errors due to ultraviolet exposure than the more common tungsten sources used with multigrade paper through an APO lens.
Our Original Poster here, though, seems to have something very unusual going on, a gross error that really sounds like tampering, dropping, or possibly a bowed piece of paper.