SLL2.1 and filters

[MrOD]

Hi,

I've had a chance to test my multi-spectral setup and I have to say it is not as easy as I thought.
I am pretty sure it is me not equipment nor setup. As I saw I have some problem with field flatness but this is not the case. Let the picture speak for itself. Any tips welcome

NGC2237 from yesterday - HST palette (SII/Ha/OIII), Lodestar x2 mono
I do not know why the decription is wrong, each channel was 15*60s

[MrOD]

For comparision another rosette picture which I have captured once with Lodestar x2 colour + 7nm Ha

[MrOD]

Forget that i've asked for now. I have to repeat tests because I have checked filterwheel and two filters were upside down  Well, you learn whole life...