I bought a
TSRCflat3 flattener for my RC12. I have bought adapters etc and collimated the telescope to a high degree. The flattener gives a pretty reasonable adjustment to flattening the field (probably half of the field curvature) but it is not what I was hoping for at all.
The image is focused (see center image)
I think there is an element of tilt and I can shim for that. What I would like to know is how do I get this field flat? Is anyone getting good results with this flattener? Any optical experts have any ideas on how to combat this problem?
Rotating the imaging train does not change the results either. The bottom left looks like it is approaching being flat but still a little way off. I have also included an out of focus star shots from the centre of the field. I look forward to any help available.