Halo around bright stars with Ha filter???

Does anybody know why I am getting halos with bright stars.

Happens with Ha filter ( not sure about S and O yet ) no problem with L filter.

Equipment:

TS Imaging Star 65mm f/6.5 Quadruplet Astrograph

ASI 1600MM cooled

ZWO 36mm filters

NGC7000 taken with unity gain, temp -10, 60 x 30 sec @ Bin2

Thanks, Tim

It looks amazing. I love this pics!

Llooks good.

And it's quite normal to have halos with brighter stars.

Better (and more expensive) filters like Astrodon are somewhat better in that regard.