Hmm .. believable in what sense? I think our eyes and memories are not objective recorders of what is in front of us - we can think of a moon as being enormous at certain times, though we know for a fact that it subtends a zillionth of a degree at our eyes. Should the photo record that objective fact, or our subjective impression that it was huge?
I have stood beside Hans at a number of these locations, and been overwhelmed by the colour in the sky - that was my subjective impression. However, I am prepared to accept (as I suspect Hans will also) that the colour in his photo does not match that which was actually in the sky. It is his interpretation, rather than a record. I don't think Hans is making a dogmatic statement here - that was rather Petrus, with his drive-by comment.