Hi,
Which field flattener was the first one, any close up photos of it, in and out entrence?
The new TS field flattener, is it the Riccardi they sell or?
I have the 2.5" Riccardi, in my setup with a TS130 APO refractor and a off-axis guider it works well, but can not handle full frame sensors. I have recently changed it to a 3" field flattener.
In the old setup with the 2.5" I had to modify the adapters to get better control of the vignetting.
http://www.astrofriend.eu/astronomy/...refractor.html
But I think you have a smaller sensor and then you will not get these problems.
Which OAG do you have?
Lars