Yes Callum the vidio did work and thanks for that.
I have Greg’s book ‘Making Beautiful Deep-Sky Images’ and that’s where I came across the Hyperstar originally.
As Greg says in his talk, he can’t understand why all beginners to astro imaging do not use one.
I am going to take the plunge and hopefully produce something worthy of publication in the BAA gallery.
Will have fun trying.
Thanks all for the advice.