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The reasons for my doubts are all comments posted above by others.
Also, the scale of images on the website is quite small (high resolution).
As far as field rot at alt-az mount is concerned, yes, it varies a lot depending on the direction of the scope is pointed at, in certain directions it is even null.. but that is serious limitation on what and when you are taking pictures.
It seems a marketing stunt to me.
Anyway, regardless of all this being true or false (most likely it is false or just plain exaggeration in some details), I am sticking to what I have and what I do or what I intended to do...
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