Hi all, I have been reading about derotator's and was wondering about their potential as an alternative to a wedge.
From the limited reading I have done which has been mainly manufacturer's pieces it would seem that they are a viable alternative to the wedge in astrophotography as it allows you to take longer exposure images like the wedge while remaining in Alt/Az. Also I have only seen them advertised for SCT's up to 10", does this mean they are not suitable anything larger like a 12"
Does anyone know of any websites other than the manufacturer's where there would be some more info in this area. Other members thoughts on this would also be appreciated.
Cheers
