Thanks guys!
I really don't know what's wrong with my Rocolax filter (and I don't think it's image processing error either). Ha regions are just not there...
Could it be that I turned filter the wrong way around? The red reflective layer should point to the telescope side, maybe I installed it backwards. Does it really matters? Hmm...
Luka, Peltier is double stacked DIY type
https://dl.dropboxusercontent.com/u/...ge_peltier.jpg