[bojan]

Finally, clear night on Saturday..
Yes, the front element of my Meade FR was flipped over, and now after repair it behaves significantly better.
It is quite usable inside ~15mm circle (no visible coma) but outside of this the filed is seriously warped. So - cropping is still the only option to deal with this.


Celestron FR-FF is way better (in terms of field flatness.. possibly in general as well).