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Cause of problem
Thanks for the link Marc - the problem is caused by the focuser tube being attached to the Primary mirror cell - The weight of the focuser, camera etc acts as a lever and deforms the cell at the 3 collimation points on the outer rim. The 8in and 10 in R/C does not have this problem as the collimation screws are located closer to the mirror centre.
There are a number of fixes out there that work with differing results and if you don't mind the expense a conversion kit is available to replace the existing 3 point suspension cell with an 18 point suspension cell - cost 1350 euros.
My biggest ***** is that this is a new design telescope produced with a known documented problem. I didn't know about it at time of purchase but I am well aware of it now -
Cheers
Geof Wingham
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