[avandonk]

I would have thought it was painfully obvious that the problem has always been differential flexure between the RH200 and the very heavy CFW and Camera. Even after getting the new rings for the RH200 I still had the same problem and it was only very marginally better. I suspect the Placebo effect was the only thing that was effective.

The engineering concept behind the the two turnbuckles and lateral bar at the bottom of the dovetail is that they form a triangle and with enough tension should minimise flexure due to changing lateral gravitational forces. So to make it VERY CLEAR we are stabilizing the CFW and Camera NOT the RH200! You do not want to know the tension those turnbuckles are at to get the movement down to one pixel per two hours. Yes that very solid ITS bends under the weight of the CFW and Camera!

The RH200 was never designed to take all this weight and far larger sensor. The Focuser, CFW and Camera weigh over eight kilograms.

I have two bars to hold the ends of the dovetail the optic train is on as this was twisting! This bar is 100mm wide and 12mm thick!

I would like to thank Cris for all his help and suggestions. He went as far as negotiating with FLI for a solution to the ten position CFW being the culprit. It was but not the only one.

Personally I am quite glad we have got over the line. Now I can just get on with imaging not engineering and optics. Till next time!


Bert